TI-Inspire manual 1. Instructions. Ti-Inspire for statistics. General Introduction

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1 TI-Inspire manual 1 General Introduction Instructions Ti-Inspire for statistics

2 TI-Inspire manual 2

3 TI-Inspire manual 3 Press the On, Off button to go to Home page

4 TI-Inspire manual 4 Use the to navigate among the choices To select an option press, the number or Enter(see below) Important If you try to divide numbers TI-Inspire will give you a fraction since a decimal is only an approximation 1 1 Which I am more than happy to live with

5 TI-Inspire manual 5 Deleting Highlight the item or column or number and hit del

6 TI-Inspire manual 6 Finding Mean, Median and Mode Step 1) Open list so you can enter your data Press t Click the above icon A new document opens with Lists & Spreadsheet on the page. Enter your data in a column ( you could use any column)

7 TI-Inspire manual 7 use the arrow to select the page you want and then hit enter to go to that page

8 TI-Inspire manual 8 Problem: Find the mean of the number of hours of TV watched by a sample of freshmen men during their first week of college. 35, 28, 29, 31, 36, 26, 23, 34,19 Click [Menu] Enter the Data in the column

9 TI-Inspire manual 9 Give column a title if you wish otherwise it will be known by the letter above it. Use alphabet keys at the bottom of the calculator to do this, Press [Menu] Hit [Menu]

10 TI-Inspire manual 10 Choose 4: Statistics The choose 1: Stat Calculations Use arrow on navigator button to move left/ right or up/down

11 TI-Inspire manual 11 Choose 1: One-Variable Statistics Choosing is done by either using the [Enter] button Or the hand in the center of the navigator button Step 2) leave num of lists on "1" and and then press [OK]

12 TI-Inspire manual 12 = mean (pronounced X bar ) Scroll down for median and other data

13 TI-Inspire manual 13 Clearing column and/ or rows of Data First columns Use Go to use center navigator button to the data entry button which will cause it to highlight click on it and go to the top of the column you want to clear when column highlights

14 TI-Inspire manual 14 Hold down [ctrl] and hit [del] Column will empty Second rows: Again use the center navigator to go all the way to the left. When the row blackens hit the [Clear] button to empty the row Several rows or several columns at the same time: Drag to select additional rows or columns Copying rows or columns Use the same procedure as above to highlight the row or column. When it is highlighted press [ctrl] C to copy a column or row and [ctrl] V to paste it.

15 TI-Inspire manual 15 Constructing a Box plot IMPORTANT: The column you want to turn into a box plot must have a name Add a new number to you list of freshman tv watches. This one watches 56 hours a week and probably will not be here the second semester. On Select Graph button to get a graph screen Use menu button

16 TI-Inspire manual 16 Choose 2: Plot Properties Choose 4: Add X Variable The name of your column of data will appear. If you have several columns of data they will all appear, plus some you have deleted. Pick the one you want to forma box plot of. Use the arrow to get to the correct one which will highlighted and click the hand.

17 TI-Inspire manual 17 The screen will rearrange itself Then choose 1: plot Type Then 2: Box Plot

18 TI-Inspire manual 18 Use the arrow move the and hand the number that appears is the where the outliers start. In this case 36 is not an outlier but anything greater is Move the hand to the line in the middle o fhte box and it will give you the median. Inthis case 30

19 TI-Inspire manual 19 Move the hand to the bottom of the box and it will give you Q1, etc. The dot by itself to the left is an outlier and is our 56 hour tv watcher

20 TI-Inspire manual 20 How to find Standard Deviation Press Home List & spread sheet/ Data Entry Enter data and give column name if you wish 4:Statistics 1: Stat Calculations 1:One Variable Statistics

21 TI-Inspire manual 21 Press center button or Enter leave on "1" to [OK] and press

22 TI-Inspire manual 22 In the first slot put the letter or name of the column that holds the data you want the Standard Deviation of Tab to the last slot Put the letter of the column where you want the results to appear. Generally choose an empty column Use navigator button to move up and downthe results Sx is the standard deviation for a sample and the one you want to use

23 σx is the standard deviation for a population TI-Inspire manual 23

24 TI-Inspire manual 24 One sample Z-test Local citizens have been concerned that the reading program in the public schools may be inferior. The superintendent hires you to conduct an experiment to investigate. You set a = 0.05 (alpha level) for making your decision. You compare the reading level of current high school seniors with established norms. The norms are compared to national reading proficienty norms and are normally distributed with M = 75 and SD = 16. You administer the reading test to 100 randomly selected high school seniors in your city. The obtained mean of the sample = 72. What is your conclusion? [On] [Home] Calculator button at bottom push center/enter [Menu] 6:Statistics 7: Stat Tests 1:zTest Push center

25 Tab to [OK] TI-Inspire manual 25

26 TI-Inspire manual 26 The results are not significantly different. Z(100)=-1.875, p>.05 However, at.060 it s awful close to being significantly different!

27 TI-Inspire manual 27 One sample T-tests The United States has the highest teen pregnancy rate in the western world, despite the fact that US teens are not more sexually active than Swedish teens, Canadian teens, or British teens. The mean teenage pregnancy rate in the US is 11.85% The rates for states in the this area ( based on survey of year olds) Arkansas 17.28% Mississippi Louisiana 17.05% Texas 15.25% H O : There is no significant difference in the pregnancy rate of the states of Arkansas, Mississippi, Louisiana and Texas compared to the rest of the nation H A: There is no significant difference in the mean teenage pregnancy rate of the four states sample and the US average. Other Alternative hypothesis are of course possible.

28 TI-Inspire manual 28 The data (the rates for Arkansas, Mississippi, Louisiana, & Texas) is in the form of a list it should be enter in column A on the Lists and Spreadsheet page and given a title. then choose 4: Statistics then choose 4:Stat Tests Choose 2:tTest. It is designed to test your sample against a larger or national known mean

29 TI-Inspire manual 29 Choose Data because you entered your data into a column on the List and Spreadsheet page. Click [OK] µ0: is for the sample or national mean you a comparing to List: is the column where you put the data from your sample Frequency: always 1 Alternate Hyp: Three hypothesis are possible A two sided Ha: µ µ0 My sample mean is significantly different from the population mean, great or less it doesn t matter it s just significantly different. Two one sided or directional Ha: µ > µ0 My sample is greater, bigger, more than, etc. the national mean Ha: µ < µ0 My sample is less than, fewer, smaller, etc. the national mean

30 TI-Inspire manual 30 1st result column: says it will put the results in the first available column. You can overwrite previous results by changing the column letter. Try Draw plot for the fun of it but generally it doesn t give you the information you want. [OK] These results would be reported as t(3) = 7.29, P <.006. However, if you are given the mean for the data the procedure is different The average age of mothers in the US when they give birth to their first child is The average age of a sample of 200 women from the Arkansas Delta region is 21.7 Sx = 2.6. Our hypothesis is: Ha: The age of mothers giving birth to their first child is significantly lower in the Delta region of Arkansas than the national average of the sample is significantly lower than the national average. Ha: µ < µ0

31 TI-Inspire manual 31 4: Statistics 4:Stat Tests" 2:t-test choose "Stats" this time Pick a column for the results and skip "plot" These results would be written: A significant difference (p<.000)was found in the mean age for mother giving birth to their first child in the Arkansas Delta region than the national average. t (199) = , p <.000. With the mean for the nation being 25.1 and the mean for the delta region of Arkansas being Means are usually given in addition to the t scores when the difference is significant. Two Independent Sample T-Test

32 TI-Inspire manual 32 This t-test is used when you have two separate sample that you are comparing. (They do not have to be the same size.) Ie. Rainfall in one city to rainfall in another, female scores on a selfesteem test compared to males scores on the same test. The Inspire has a 2-Sample T-Test Enter the data for the two groups you are comparing in two, usually columns 1 & 2. Give them a title [menu] 4:Statistics 4:Stat Tests 4:2 Sample t Test If you entered data in the columns choose "Data" If you have μ, σ and n then use "Stats"

33 TI-Inspire manual 33 Enter Data into 2 columns and title [Menu] 4: Statistics 4:Stat Tests

34 TI-Inspire manual 34 4: 2-Sample t Test You have data in calculator choose Data format [OK]

35 TI-Inspire manual 35 Put in name of two columns with data (NW and SE) List 1 is your first column of data. Click on the Down arrow and pick your column title from the list List 2 is your second column of data again pick the name from the list Leave Frequency as 1 Choose you Alternative hypothesis (Ha:) from the drop down list µ1>µ2 the first group is significantly more, faster, greater, etc. than the second group µ1<µ2 the first group is significantly less than, smaller, etc, than the second group µ1 µ2 the difference between group 1 and group 2 is not significant Choose hypothesis HA: NW will have higher incomes the SE HA: µ1 > µ2 Pooled Yes (If in doubt choose pooled ) Put results in empty column C[] or whatever empty column you want

36 TI-Inspire manual 36 [OK] t = t value PVal = probability df = degrees of freedom 1 = mean of column 1

37 TI-Inspire manual 37 2 = mean of column 2 Sx1 standard deviation column 1 Sx2 = standard deviation column 2 Results t(9.9)=2.6, p<.02 You should also report Means and SD. NW Ar = \$25,960.80, S = \$ and SE Ar = \$22,270.50, S = \$ Not only is the average income in the north west higher than the southeast but the variance is smaller in the southeast

38 TI-Inspire manual 38 Matched pairs t-test Put Data in Column A and Column B move to the third column "C" and title it diff In the area just below the title but above the data area type the following formula =a[ ]-b[ ] this tells the calculator to subtract the data in column 2 from column 1 and put results in column 3

39 TI-Inspire manual 39 Go to Menu 4: Statistics 4: Stat Test 2:t test you are not using the 2 sample t-test because you are measuring the actual difference against 0 which is what the average difference would be if there is no difference Data Input method" is "data" For μ use "0" List: where you want the results Frequency: "1" Deciding on Ha: is a little tricky: The easiest way is two do a two tailed test If you believe there will be a difference but uncertain of the direction Ha: μ μ0 However is you wish to do a one tailed the easiest way is to always put the group you think will be more, greater bigger, better, larger etc. in the first column A[ ] and the group you think will be less, smaller, fewer in the second column B[ ]. And then always choose Ha:µ>0

40 TI-Inspire manual 40 Anova Doing an ANOVA on the TI is amazing simple if you have been doing t-tests Push the [On/Home] button Find the press the List and Spreadsheets icon Put each list of data in a different column (as this example has) [Menu] 4: Statistics 4: Stat Test C:ANOVA [ENTER] Choose "data" Enter the number of groups( number of columns)

41 TI-Inspire manual 41 Choose the names of the groups or use a A[ ] etc. Put results in empty column [OK] Read results and create a Source or Summary Table Results are reported both in form of a Source table and as F (3, 20)= 32.68; p<.01 Source SS df MS F p Between <.001 Within Total

42 TI-Inspire manual 42 Correlations Enter the data you want to correlate into two columns in the Data and Spreadsheet. This would usually be columns A [ ] and B[ ], title them. Punch [menu] "4:Statistics" "1: Stat Calculations" "4:Linear Regressions(a+bx) There is also a 3: Linear Regression with the formula (mx+b) This one will give you a correlation but it will also give you extra data you don t want to bother with. Avoid it. X List is usually the factor you believe affects the second. If you just believe there is a relationship either factor can be X Y List is usually the factor affected by the X factor. Again if you are just positing a relationship either factor can be Y Leave Save RegEqu to alone Leave Frequency as 1 Skip Category List and Include Categories Put results in an empty column

43 TI-Inspire manual 43 r = correlation Regression Getting a and b on the TI-Nspire to run a regression Run a correlation and look again it gives you a and b (see example above)

44 TI-Inspire manual 44 Chi Square As an example assume the following Chi Square or matrix Believes in Santa Does not Believe in Santa male female First set up a matrix with your number Undecided about The jolly old man choose calculator page (not scratch pad) On the calculator page type a: = [35,43,27:43,25,10]

45 TI-Inspire manual 45 [ctrl] and ( will give you the brackets [] The comma is the left of the o The semi-colon is activated by the? button which produces a number of special symbols. Choose semi-colon

46 TI-Inspire manual 46 After you have closed the bracket store the matrix in letter a you can store it in a different letter if a is already being used. Th e store command sto is activated by ctrl [Menu] 6: Statistics 7: stat tests 8: χ 2 2-way Test [Enter]

47 TI-Inspire manual 47 Choose the letter a or whatever you designated the matrix as for the Observed Matrix: [OK] You now have both χ 2 and you p value

48 TI-Inspire manual 48 Goodness of Fit 1 X Put observed numbers in column a(and name) Put expected number in column b ( and name) Expected can be either 1. Total divided by number of factors; You are saying that all factors will have equal amounts i.e. In the case of bags of M&M s you would be saying that there is an equal number of each color in each bag 2. A known statistic you are comparing your results to./ ie. We compare the number of M&M s, by color, in a sample of bags to the number of each color the company claims on its website. [Menu] 4: Statistics 4: Stat Tests 7: χ 2 GOF [ENTER]

49 The results gives us our χ 2 and probability TI-Inspire manual 49

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