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1 MATHEMATICS II Unit #4 Data Analysis and Probability/Statistics 1 Day 1 E. Q. How do I calculate the mean and standard deviation and use these measures to compare data sets? Standard MM2D1. Using sample data, students will make informal references about population means and standard deviations. b. Understand and calculate the means and standard deviations of sets of data. c. Use means and standard deviations to compare data sets. Opening Warm Up: Find the mean. Draw a box and whisker graph and label the lower quartile and upper quartile, and explain how to find the interquartile range Height (in inches) of selected students in a class: 58, 61, 66, 60, 68, 65, 64, 67, 70, 60 Work session Mini lesson Frayer Model of Vocabulary words: Review mean and interquartile range (IQR). Introduce the following symbols:, x, σ, σ 2 Model, define, and explain new vocabulary: variance and standard deviation by working Work Session Lesson 1 problems 1 & 2 Students work in pairs on Work Session Lesson 1 problems 3 & 4 Closing Student pairs are selected to share how they found their answers with the whole class. Ticket out the door match formulas with statistical terms

2 Definition Frayer Model for MEAN Formula 2 Example MEAN MEAN Your Example Definition Frayer Model for INTERQUARTILE RANGE (IQR) Formula Example INTERQUARTILE MEA RANGE MEAN Your Example

3 Definition Frayer Model for VARIANCE Formula 3 Example VARIANCE MEA MEAN Your Example Definition Frayer Model for STANDARD DEVIATION Formula Example STANDARD MEA DEVIATION MEAN Your Example

4 4 Math 2 Unit 4 Lesson 1 Name Date Period Find the mean, median, variance, standard deviation, and interquartile range of each data set. Show your work. OPENING 1.) 6, 22, 4, 15, 14, 8, 8 Mean = Median = Variance (σ 2 ) = Standard Deviation (σ) = Interquartile Range (IQR) = 2.) 10, 15, 12, 20, 25, 22, 29 Mean = Median = Variance (σ 2 ) = Standard Deviation (σ) = Interquartile Range (IQR) =

5 5 3.) 100, 150, 100, 130, 125, 135 Mean = Median = Variance (σ 2 ) = Standard Deviation (σ) = Interquartile Range (IQR) = 4.) 15, 11, 18, 14, 14, 13, 17, 18 Mean = Median = Variance (σ 2 ) = Standard Deviation (σ) = Interquartile Range (IQR) =

6 Work Session Lesson 1 Teacher Notes/Answer Key 6 Typically, mean answers were rounded to the nearest hundredth and variance/standard deviation answers to the nearest thousandth if the answer was not a terminating decimal. 1.) 6, 22, 4, 15, 14, 8, 8 4, 6, 8, 8, 14, 15, 22 Mean = 77 7 = 11 Standard Deviation = Median = 8 IQR = 15 6 = 9 Variance = 34 2.) 10, 15, 12, 20, 25, 22, 28 10, 12, 15, 20, 22, 25, 29 Mean = = 19 Standard Deviation = Median = 20 IQR = = 13 Variance = ) 100, 150, 100, 130, 125, , 100, 125, 130, 135, 150 Mean = = Standard Deviation = Median = ( ) 2 = IQR = = 35 Variance = 1983, = ) 15, 11, 19, 14, 14, 13, 17, 18 11, 13, 14, 14, 15, 17, 18, 18 Mean = = 15 Standard Deviation = Median = ( ) 2 = 14.5 IQR = = 4 Variance = 51 8 = 6.375

7 7 Math 2 DAY 1 Name Unit 4 TICKET OUT THE DOOR Match the formula to the correct term by drawing a line. 1. Interquartile Range A. 2. Mean 3. Standard Deviation B. 4. Variance C. D. Q 3 Q 1 Math 2 DAY 1 Name Unit 4 TICKET OUT THE DOOR Match the formula to the correct term by drawing a line. 1. Interquartile Range A. 2. Mean 3. Standard Deviation B. 4. Variance C. D. Q 3 Q 1

8 8 Day 2 E. Q. How do I calculate the mean and standard deviation and use these measures to compare data sets? Standard MM2D1. Using sample data, students will make informal references about population means and standard deviations. b. Understand and calculate the means and standard deviations of sets of data. c. Use means and standard deviations to compare data sets. Opening Warm-up: Write the formulas using new symbols for mean, interquartile range, variance, and standard deviation. Mini Lesson: Have students reference their Frayer Model sheets for vocabulary from Lesson 1. Using Statistical Practice Worksheet, model problem 1. Work session Students work in pairs on Statistical Practice Worksheet problems 2,3,4 Closing Students explain their work to the whole class. Homework: Outliers and Central Tendency

9 DAY 2 STATISTICAL PRACTICE OPENING NAME DATE PERIOD 9 Definitions Review Write the formula or explain how to find each of the following statistical measures: MEAN MEDIAN MODE RANGE VARIANCE STANDARD DEVIATION INTERQUARTILE RANGE The following problems are adapted from Basic Statistical Analysis, 7 th Edition, by Richard C. Sprinthall. Compute each of the seven statistical measures for each set of data. 1.) A group of seven university students was randomly selected and asked to indicate the number of study hours each put in before taking a major exam. The data are as follows: Hours of Student Study WORK SESSION

10 10 2.) The grade-point averages for the seven university students selected above were computed. The data are as follows: Student GPA ) A researcher investigating a new product for clearing up acne selects a random sample of 10 teenagers, gives them the facial product to use and asks them to report back how many days it took for the facial condition to clear up. The results (in days) were as follows: 20, 8, 10, 14, 15, 14, 12, 11, 14, ) A clinical psychologist is interested in assessing the prevalence of MDD (Major Depressive Disorders) among a group of fourth-grade students. A random sample of 13 students was selected and given the Children s Depression Inventory (CDI), a selfreport instrument that measures levels of depression. Scores above 13 are said to indicate a major depressive disorder. The scores were as follows: 8, 10, 11, 7, 13, 4, 8, 7, 9, 3, 15, 10, 10.

11 STATISTICAL PRACTICE TEACHER NOTES/ANSWER KEY 11 Note: The emphasis of Math 2 is on using means and standard deviations, but the students were exposed to median, quartiles, and interquartile range in Math 1 (MM1D3a). They had previously also dealt with mean, median and mode in 7 th grade (M7D1c) as well as range, quartiles, and interquartile range (M7D1d). It is the teacher s discretion whether to compute every statistical measure or whether to focus only on those emphasized in Math 2. 1.) Data were: 40, 30, 35, 5, 10, 15, 25 5, 10, 15, 25, 30, 35, 40 Mean = = Variance = = Median = 25 Std. Dev. = Mode = no mode IQR = = 25 Range = 40 5 = 35 2.) Data were: 3.75, 3.00, 3.25, 1.75, 2.00, 2.25, , 2.00, 2.25, 3.00, 3.00, 3.25, 3.75 Mean = 19 7 = 2.71 Variance = = Median = 3.00 Std. Dev. = Mode = 3.00 IQR = = 1.25 Range = = ) Data were: 20, 8, 10, 14, 15, 14, 12, 11, 14, 13. 8, 10, 11, 12, 13, 14, 14, 14, 15, 20 Mean = = 13.1 Variance = = 9.49 Median = ( ) 2 = 13.5 Std. Dev. = Mode = 14 IQR = = 3 Range = 20 8 = 12 4.) Data were: 8, 10, 11, 7, 13, 4, 8, 7, 9, 3, 15, 10, 10. 3, 4, 7, 7, 8, 8, 9, 10, 10, 10, 11, 13, 15 Mean = = 8.85 Variance = = Median = 9 Std. Dev. = Mode = 10 IQR = = 3.5 Range = 15 3 = 12

12 12 DAY 2 HOMEWORK Outliers and Central Tendency Connect to Prior Learning The puzzle below can be used as a way to review finding measures of central tendency and the effect of an outlier on the measures of central tendency. Questions to Start the Lesson In Questions 1 10, use the data set to answer the questions. Then find the corresponding letter in the table to the left to answer the riddle. What did Watson say to Holmes? 2, 3, 4, 5, 6, 8, 9, 9, Find the mean. 2. Find the median. 3. Find the mode. 4. Find the standard deviation. 5. Find the range. 6. Which value is an outlier? In Questions 7 11, find the measures of central tendency after removing the outlier. 7. Find the mean. 8. Find the median. 9. Find the range. 10. Find the standard deviation.

13 Day 3 E. Q. How do I calculate the mean and standard deviation and use these measures to compare data sets? 13 Standard Opening Work session MM2D1. Using sample data, students will make informal references about population means and standard deviations. b. Understand and calculate the means and standard deviations of sets of data. c. Use means and standard deviations to compare data sets. Warm Up: Write two sentences using the word deviation. How would you define deviation? Mini lesson: Work and explain the OPENING on Performance Task 1 Students work in groups of 3 on the WORK SESSION on Performance Task 1 Closing Students share out and explain their answers to Performance Task 1. Students review the vocabulary: Mean deviation, Variance, and Standard Deviation.

14 Day 3 Mathematics II Unit 4 Performance Task 1 14 Name Date OPENING Your teacher has a problem and needs your input. She has to give one math award this year to a deserving student, but she can t make a decision. Here are the test grades for her two best students: Bryce: 90, 90, 80, 100, 99, 81 98, 82 Brianna: 90, 90, 91, 89, 91, 89, 90, 90 Write down which of the two students should get the math award and discuss why they should be the one to receive it. Calculate the mean () of Bryce s distribution. Calculate the mean deviation, variance, and standard deviation of Bryce s distribution. Fill out the table to help you calculate them by hand. i for Bryce i i ( ) 2 i Σ

15 Mean deviation for Bryce: mean deviation : n i= 1 i n 15 Variance for Bryce: variance : n i= 1 ( ) i n 2 Standard deviation for Bryce: standard deviation : n i= 1 ( ) i n 2 What do these measures of spread tell you?

16 WORK SESSION Calculate the mean () of Brianna s distribution. 16 Calculate the mean deviation, variance, and standard deviation of Brianna s distribution. Fill out the table to help you calculate them by hand. i for Brianna i i ( ) 2 i Σ Mean deviation for Brianna: mean deviation : n i= 1 i n Variance for Brianna: variance : n i= 1 ( ) i n 2 Standard deviation for Brianna: standard deviation : n i= 1 ( ) i n 2 What do these measures of spread tell you? CLOSING Students share their answers with whole class.

17 Day 4 E. Q. How do I calculate the mean and standard deviation and use these measures to compare data sets? 17 Standard Opening Work session Closing MM2D1. Using sample data, students will make informal references about population means and standard deviations. b. Understand and calculate the means and standard deviations of sets of data. c. Use means and standard deviations to compare data sets. Warm Up: What positions are on a baseball team? Mini lesson: Review Mean, Variance, Mean Deviation and Standard Deviation using a matching game at the board. Place the vocabulary on one set of colored paper, formulas on another color of paper and definitions on another color of paper. You could place symbols for mean, standard deviation, and variance on another colored paper. Place magnetic tape on the back of each. Place vocabulary words on one side of white board and place definitions and formulas randomly on the other side of the white board. Choose students to come up and select either a definition or formula and place it by the correct word. Explain the instructions to the Supplemental Activity: Baseball Teams 1994 Salaries Students work in groups of 2 or 3 on the Supplemental Activity: Baseball Team 1994 Salaries Students share and explain their solutions to whole class. Do you think athletes should make this much money? Why or why not?

18 Math 2 Unit 4 Day 4 Supplemental Activity: Baseball Team 1994 Salaries 18 Teacher Instructions 1. Have students work in groups. Provide students with calculators. 2. Each group should pick two baseball teams. 3. Each group fills out an activity sheet on each team filling in the data and finding the mean, variance, and standard deviation for each team s salaries. After analyzing the data, each group should write a brief paragraph comparing and contrasting the statistical data and the real world conclusions that can be drawn from the data. 4. Groups share their findings with the class as a conclusion.

19 1994 Atlanta Braves 19 Tom Glavine 4,750,000 Greg Maddux 4,000,000 Jeff Blauser 3,750,000 Fred McGriff 3,750,000 John Smoltz 3,250,000 Terry Pendleton 3,200,000 David Justice 3,200,000 Deion Sanders 2,916,667 Steve Avery 2,800,000 Mike Stanton 1,400,000 Kent Mercker 1,225,000 Mark Lemke 1,100,000 Rafael Belliard 800,000 Steve Bedrosian 750,000 Dave Gallagher 700,000 Bill Pecota 575,000 Charlie O'Brien 550,000 Gregg Olson 500,000 Greg McMichael 245,000 Mark Wohlers 180,000 Milt Hill 158,000 Mike Bielecki 150,000 Ryan Klesko 111,500 Tony Tarasco 111,500 Javier Lopez 111,500 Chipper Jones 109,000 Mike Kelly 109, New York Yankees Jimmy Key 5,250,000 Danny Tartabull 4,550,000 Don Mattingly 4,020,000 Paul O'Neill 3,833,334 Melido Perez 3,450,000 Terry Mulholland 3,350,000 Wade Boggs 3,100,000 Jim Abbott 2,775,000 Matt Nokes 2,500,000 Steve Howe 1,900,000 Mike Gallego 1,575,000 avier Hernandez 1,525,000 Luis Polonia 1,500,000 Randy Velarde 1,125,000 Pat Kelly 810,000 Jim Leyritz 742,500 Mike Stanley 512,500 Donn Pall 500,000 Daryl Boston 400,000 Paul Gibson 250,000 Jeff Reardon 250,000 Scott Kamieniecki 235,000 Bemie Williams 225,000 Rob Wickman 180,000 Gerald Williams 115,000 Sterling Hitchcock 112,000

20 Oakland Athletics Rickey Henderson 4,800,000 Ruben Sierra 4,700,000 Bob Welch 3,450,000 Bobby Witt 3,250,000 Mark McGwire 3,000,000 Terry Steinbach 2,800,000 Ron Darling 2,250,000 Mike Bordick 1,050,000 Stan Javier 600,000 Lance Blankenship 550,000 Edwin Nunez 430,000 Mike Aldrete 430,000 Todd Van Poppel 397,000 Troy Neel 225,000 Scott Hemond 210,000 Brent Gates 190,000 Scott Brosius 155,000 Billy Taylor 132,500 Steve Ontiveros 120,000 Junior Noboa 120,000 Steve Karsay 119,000 John Briscoe 114,000 Geronimo Berroa 109,000 Carios Reyes 109,000 Dave Righetti 109, Chicago Cubs Ryan Sandberg 5,975,000 Mark Grace 4,400,000 Randy Myers 3,583,333 Jose Guzman 3,500,000 Mike Morgan 3,375,000 Sammy Sosa 2,950,000 Steve Buechele 2,550,000 Shawon Dunston 2,375,000 Dan Plesac 1,700,000 Glenallen Hill 1,000,000 Willie Wilson 700,000 Jose Bautista 695,000 Rick Wilkins 350,000 Shawn Boskie 300,000 Derrick May 300,000 Mark Parent 250,000 Anthony Young 230,000 Rey Sanchez 225,000 Frank Castillo 225,000 Willie Banks 190,000 Karl Rhodes 145,000 Jim Bullinger 145,000 Steve Trachsel 112,000 Eddie Zambrano 112,000 Jose Hernandez 112,000 Jessie Hollins 109,000 Blalse Ilsley 109,000

21 Houston Astros Doug Drabek 4,250,000 Greg Swindell 3,750,000 Craig Bigglo 3,350,000 Pete Harnisch 3,205,000 Ken Caminiti 3,200,000 Steve Finley 3,050,000 Mitch Williams 2,500,000 Jeff Bagwell 2,400,000 Luis Gonzalez 1,630,000 Mike Felder 850,000 Darryl Kile 477,500 Tom Edens 475,000 Kevin Bass 400,000 Andujar Cedeno 340,000 Sid Bream 300,000 Eddie Taubensee 275,000 Scott Servais 272,500 Brian Williams 190,000 Chris Donnels 170,000 Andy Stankiewicz 138,000 Todd Jones 135,000 Braulio Castillo 120,000 Shane Reynolds 117,500 Mike Hampton 114,000 Tony Eusebio 114,000 James Mouton 109,000 Roberto Petagine 109, Montreal Expos Larry Walker 4,025,000 Marquis Grissom 3,560,000 Ken Hill 2,550,000 John Wetteland 2,225,000 Moises Alou 1,400,000 Mel Rojas 850,000 Randy Milligan 600,000 Darrin Fletcher 600,000 Jeff Fassero 315,000 Mike Lansing 200,000 Sean Berry 200,000 Wilfredo Cordero 200,000 Pedro Martinez 200,000 Freddie Benavides 195,000 Lenny Webster 180,000 Jeff Shaw 172,500 Tim Scott 165,000 Lou Frazier 140,000 Gil Heredia 135,000 Denis Boucher 135,000 Tim Spehr 132,000 Kirk Rueter 130,000 Rondell White 112,000 Cliff Floyd 109,500 Jeff Gardner 109,000

22 St. Louis Cardinals Gregg Jefferies 4,600,000 Bob Tewksbury 3,500,000 Ozzie Smith 3,000,000 Todd Zeile 2,700,000 Tom Pagnozzi 2,575,000 Jose Oquendo 2,150,000 Ray Lankford 1,650,000 Bernard Gilkey 1,635,000 Mark Whiten 1,008,334 Brian Jordan 846,667 Rich Rodriguez 700,000 Gerald Perry 650,000 Luis Alicea 650,000 Rob Murphy 600,000 Geronimo Pena 575,000 John Habyan 250,000 Rick Sutcliffe 250,000 Paul Kilgus 225,000 Mike Perez 200,000 Rheal Cormier 160,000 Rene Arocha 140,000 Vicente Palacios 140,000 Erik Pappas 140,000 Allen Watson 130,000 Stan Royer 130,000 Tom Urbani 130,000 Donovan Osbome 112,000 Terry McGriff 109, Detroit Tigers Cecil Fielder 4,237,500 Belcher 3,400,000 Mike Moore 3,333,334 Alan Trammell 3,000,000 Eric Davis 3,000,000 Lou Whitaker 2,783,333 David Wells 2,500,000 Bill Gullickson 2,400,000 Travis Fryman 2,400,000 Tony Phillips 2,366,667 Mickey Tettleton 1,833,334 Kirk Gibson 1,500,000 Mike Henneman 1,333,333 Bill Krueger 1,300,000 Chad Kreuter 1,000,000 Storm Davis 800,000 Joe Boever 800,000 Scott Livingstone 365,000 John Doherty 350,000 Junior Felix 350,000 Juan Samuel 300,000 Milt Cuyler 275,000 Mike Gardiner. 150,000 Chris Gomez 140,000 Danny Bautista 125,000

23 Activity Sheet- Analysis of Baseball Player s salaries Please fill out one sheet per group for each team you select. Group Members: 23 Baseball team: 1. How many players are on the team? 2. What is the mean salary for players on this team? 3. Use the chart below to help you calculate the mean deviation, variance, and standard deviation of this team s salary distribution. i (player salary)

24 Sum (Σ) 24

25 25 The mean deviation: Variance: Standard Deviation: 4. Write a paragraph telling what you learned from the data and stating any conclusions you could draw from the data.

26 Day 5 E. Q. How do I calculate the mean and standard deviation and use these measures to compare data sets? 26 Standard Opening Work session Closing MM2D1. Using sample data, students will make informal references about population means and standard deviations. b. Understand and calculate the means and standard deviations of sets of data. c. Use means and standard deviations to compare data sets. Warm Up: Data: 4,2,8,4,6,1,3,7 Find mean and standard deviation. Show your work. Mini lesson: Review definitions and symbols for variance and standard deviation. Use the Graphic Organizer for relationship between variance and standard deviation (Brainstorming activity). Model Performance Task 2 Problems 1 and 2 Students work in pairs on Performance Task 2 questions #3, 4, 5 Students share out answers from Work Session Quiz: Performance Task 2 (problems # 6, 7, 8) Students share their answers with whole class.

27 27 Day 5 Brainstorm on the similarities and differences between Variance and Standard Deviation Similarities Differences

28 Day 5 Mathematics II Unit 4 Performance Task 2 Name Date 28 OPENING Review the definition of variance and standard deviation. Discuss the relationship between variance and standards deviation. Guide students through problem 1. (Teachers may use PowerPoint written for Day 1 as review.) 1. Create a set of 6 data points such that the variance and standard deviation is zero. Make a dotplot of the distribution. Data points,,,,, 2. Create a set of 6 data points such that the variance is four and the standard deviation is two and the mean is seven. Make a dotplot of the distribution. Data Points,,,,, WORK SESSION 3. Create a set of 6 data points such that the variance and standard deviation is one. Make a dotplot of the distribution. Data Points,,,,, 4. Create a set of 6 data points such that the variance is four and the standard deviation is two. Make a dotplot of the distribution. (Accelerated Math II - - Create numbers that are not the same +/- every time.) Data Points,,,,,

29 29 5. Create a set of 6 data points such that the variance is sixteen and the standard deviation is four and the mean is ten. Make a dotplot of the distribution. Data Points,,,,, CLOSING Students share answers with the class. Quiz: Students answer questions 6-8 Day 5 Quiz Name Date 6. Describe the process you used to come up with your answers. 7. What is the relationship between the standard deviation and variance? 8. What does the standard deviation measure?

30 30 Day 5 Acceleration Math 2 Unit 4 Lesson 3 Worksheet NAME DATE 1. A company that manufactures plastic tubes takes ten samples from one machine and ten samples from another machine. The outside diameter of each sample is measured with a digital caliper. The company s goal is to produce tubes that have an outside diameter of exactly 1 inch. The results of the measurements are shown below. Machine 1: 1.000, 0.998, 1.001, 1.000, 0.997, 1.001, 1.002, 0.996, 0.998, Machine 2: 0.997, 1.000, 0.998, 0.996, 1.000, 0.998, 1.000, 0.998, 1.001, A. Find the mean diameter of the samples for each machine. B. Find the standard deviation of the samples for each machine. C. Which machine produces an average closest to the company s goal? D. Which machine produces the more consistent diameter? E. Suppose that the last measurement for Machine 2 above was instead of What affect does this new measurement have on the mean and standard deviation? 2. The average number of textbooks in professors offices at the University of Georgia is 16, and the standard deviation is 5. Assume that the person who compiled this data surveyed ten professors. Give an example of the data that the person could have collected. 3. Your math teacher asks you to collect data to support your hypothesis that every ice cream store in South Georgia serves an average of 20 flavors. Give an example of data you may collect that would support an average of 20 flavors with a standard deviation of The following data set gives the prices (in dollars) of cordless phones at an electronics store. Find the variance and standard deviation. 35, 50, 60, 60, 75, 65, If the standard deviation of a set of data is 3, what is the variance? 6. If the variance of a set of data is 16, what is the standard deviation? 7. The following data set gives the calories in a 1-ounce serving of several breakfast cereals. Find the variance and standard deviation. 135, 115, 120, 110, 110, 100, 105, 110, 125

31 31 Day 6 E. Q. How do I calculate the mean and standard deviation and use these measures to compare data sets? Standard MM2D1. Using sample data, students will make informal references about population means and standard deviations. b. Understand and calculate the means and standard deviations of sets of data. c. Use means and standard deviations to compare data sets. Opening Warm Up: Look at Performance Task 3 Problem 1 Mini Lesson: Performance Task 3 Problem 2 Work session Closing Performance Task 3 Problems 2a,2b,2c, 3 Students share out answers. Summarize lesson by guiding students to discover the formulas for finding mean and standard deviation from a frequency chart.

32 Day 6 Mathematics II Unit 4 Performance Task 3 32 Name Date OPENING Warm Up: Problem 1 2,2,2,2,2,3,3,3,3,3,3,3,3,3,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5 Given the data, calculate the mean by hand: Cody and Bernice both got the correct answer, but it took Bernice a lot longer. Bernice added all of the values and divided the sum by 30. Cody told her that there was a quicker way to do it. Can you figure out how Cody did it? Show how Cody calculated the mean below. Mini Lesson Problem 2 The teacher then asked the students to calculate the standard deviation of the data by hand. 2,2,2,2,2,3,3,3,3,3,3,3,3,3,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5 Carl made a table, listed every data point, and used the formula that he learned two days ago, standard deviation : n i= 1 ( ) i n 2, to calculate the standard deviation. Jessica finished the problem in half of the time that it took Carl because she listed her data in a frequency distribution and calculated the standard deviation in a slightly different manner. Show how Jessica calculated the standard deviation below. i F i = frequency i - ( i - ) 2 F i ( i - ) 2

33 33 WORK SESSION 2a. Jessica then taught Gabe her method to calculate the standard deviation. Gabe did not get (2 3.5) + 9(3 3.5) + 5(4 3.5) + 11(5 3.5) the correct answer. He did the following: 30 What mistake(s) did Gabe make? 2b. Jessica also taught Melody the method to calculate the standard deviation. Melody also did not get the correct answer. She did the following: ( ) + 9( ) + 5( ) + 11( ) 4 What mistake(s) did Melody make? 2c. Jessica also taught Maria the method to calculate the standard deviation. Maria also did not get the correct answer. She did the following: ( ) + 9( ) + 5( ) + 11( ) 30 What mistake(s) did Maria make? Problem 3 Use Cody s and Jessica s method to calculate the mean and the standard deviation of the frequency distribution below. i F i i - ( i - ) 2 F i ( i - ) 2

34 CLOSING Students share out answers with class. 34 Guide the class in the discovery of the following formulas. 1. Make a formula for finding the mean of any frequency distribution. Let F i stand for the frequency. 2. Make a formula for finding the standard deviation of a frequency distribution.

35 MATHEMATICS II Unit #4 35 Day 7 E. Q. 1. How do you make informal references about means and standard deviations? 2. How do you use a calculator to find the means and standard deviations of a set of data? 3. How does the Empirical Rule apply to a distribution of a data set? Standard Opening Work session Closing MM2D1: Using sample data, students will make informal inferences about population means and standard deviations b. Understand and calculate the means and standard deviations of sets of data c. Use means and standard deviation to compare data sets. Warm Up: Make a dot plot for the following data: 5,5,5,6,6,7,7,7,7,7,8,9,9,9,10,10,10,10 Mini Lesson: Review Vocabulary Sheet. Point out measures of center and measures of variability. Look at Performance Task 4 Model Problem 1&2 Pass out graphing calculators Performance Task 4 Problem 3& 4 Share out Problems 3 and 4 for class group discussion.

36 Vocabulary Sheet for Math II Unit 4 36 Vocabulary- (to be used throughout lesson) Empirical Rule is as follows: If a distribution is normal, then approximately 68% of the data will be located within one standard deviation symmetric to the mean 95% of the data will be located within two standard deviations symmetric to the mean 99.7% of the data will be located within three standard deviations symmetric to the mean Golden Ratio: 1+ 5 ϕ = which is approximately = Measures of Center Mean: The average = i = 1 n N i. The symbol for the sample mean is. The symbol for the population mean is μ. Median: When the data points are organized from least to greatest, the median is the middle number. If there is an even number of data points, the median is the average of the two middle numbers. Mode: The most frequent value in the data set. Measures of Spread (or variability) Interquartile Range: Q3 Q1 where Q 3 is the 75 th percentile (or the median of the second half of the data set) and Q 1 is the 25 th percentile (or the median of the first half of the data set). i Mean Deviation: where i is each individual data N point, is the sample mean, and N is the sample size Variance: In this unit, I decided to use the population variance throughout. The students have an intuitive understanding of the population variance as opposed to the sample variance. The sample variance should be explored in the future. The formula for the population variance is as follows:

37 variance : n i = 1 ( ) i n Standard Deviation: The standard deviation is the square root of the variance. The formula for the population standard deviation is as follows: standard deviation : n i = 1 ( ) i n Normal Distribution: The standard deviation is a good measure of spread when describing a normal distribution. Many things in life vary normally. Many measurements vary normally such as heights of men. Most men are around the average height, but some are shorter and some are taller. The shape of the distribution of men s heights will be a bell shape curve. All normal distributions are bell shaped; however, all bell shaped curves are not normal. If a distribution is a normal distribution, then the Empirical Rule should apply (see Empirical Rule above). Dotplot: A statistical chart consisting of a group of data points plotted on a simple scale. Outliers: An observation or point that is numerically distance from the rest of the data.

38 Day 7 Math II Unit 4 Performance Task 4 38 Name Date Mini Lesson Problem 1 Under certain conditions, you will discover during this activity, the Empirical Rule (Normal Distribution) can be used to help you make a good guess of the standard deviation of a distribution. The Empirical Rule is as follows: For certain conditions (which you will discover in this activity), 68% of the data will be located within one standard deviation symmetric to the mean 95% of the data will be located within two standard deviations symmetric to the mean 99.7% of the data will be located within three standard deviations symmetric to the mean For example, suppose the data meets the conditions for which the empirical rule applies. If the mean () of the distribution is 10, and the standard deviation of the distribution is 2, then about 68% of the data will be between the numbers 8 and 12 since 10-2 =8 and 10+2 = 12. We would expect approximately 95% of the data to be located between the numbers 6 and 14 since 10-2(2) = 6 and (2) = 14. Finally, almost all of the data will be between the numbers 4 and 16 since 10 3(2) = 4 and (2) = 16. For each of the dotplots below, use the Empirical Rule to estimate the mean and the standard deviation of each of the following distributions. Then, use your calculator to determine the mean and standard deviation of each of the distributions. Did the empirical rule give you a good estimate of the standard deviation? ***For your convenience, there are 100 data points for each dotplot.*** Problem 1 Collection 1 Dot Plot x Data Frequency Estimated mean: Estimated standard deviation:

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