Teacher Page. Data Analysis / Day # 6 Scatterplots, Box and Whiskers, and Stem and Leaf
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1 Teacher Page Data Analysis / Day # Scatterplots, Box and Whiskers, and Stem and Provided a scatter plot, the student should be able identify the mean for dependent and independent variables. Using s stem and leaf plot find the mean, median, and mode. Multiple Choice: point. Which scatter plot shows a negative relationship (or negative correlation) between the two variables? a. c. b. d.
2 . The following stem-and-leaf plots display the scores on a 00-point chapter test for students in two Algebra I classes taught by Mr. Ortega. There are 5 students in each class. (Key: 5 represents a score of 5.) For the st period class, the mean score is 7 and the median is 75. For the 4th period class, the mean is 75 and the median is 7. Based on analyzing these data and looking at the plots, which conclusion should Mr. Ortega make about teaching these two classes? a. The median score for the 4th period class is higher, so I should give that class more difficult tests. b. The students in both classes are doing about the same on the average, so I should teach both classes exactly the same way. c. Because about a quarter of the students in the st period class got failing grades (below 0), I should give that class easier tests than the 4th period class. d. The st period class scores are much more spread out, with more students scoring very high or very low than in the 4th period class. I could have students in the st period class work in groups, with the stronger students helping the weaker ones.
3 Free Response: Points : The chart below shows a scatter plot relating eight persons height with their shoe size. Estimate the mean height and mean shoe size of the group. Height compared w ith Shoe Size height inches shoe size Free Response: 4 Points 4. Example : Use the stem and leaf plot below to find the mean, median, mode, and range. Inches of Snowfall 5
4 Name: Date: Per: Student Page: Geometry / Day # Composite Figures Multiple Choice: point. Which of the scatter plots shows a positive correlation? a. y c y 4 5 x 4 5 x b. y d. y x 4 5 x
5 . Make a stem-and-leaf plot for the following set of data..,.,.8,.,.,.8,.,.8 a. Stem c. Stem =. 0. =.0 b. Stem d. Stem =. 8 =.8
6 Free Response: Points. The population of an endangered animal species has been increasing. Make a scatter plot using the data given in the table. Describe the correlation as positive, negative, or no correlation. Year Population Pop Year
7 Free Response: Points 4. Bob and Nancy recorded their last ten rounds of golf scores in the stem-and-leaf plot below. Use measures of central tendency to justify your answers. a. Who is the better golfer? (A player with a lower score beats a player with a higher score.) b. Is one golfer more consistent than the other? Explain. Nancy Stem Bob = 75 Free Response: 4 Points 5. Use the stem and leaf plot below to find the mean, median, mode, and range. Hours worked per month
8 DAY Teacher Page KEY Multiple Choice Point. B After drawing a line of best fit the line is going downward from left to right.. D Free Response Points. The students should estimate the mean. Valid answer for height 0 70 inches. (pt) Exact answer for height =.5 inches. Valid answer for shoe size 9 0. (pt.) Exact answer for shoe size 9.4 Free Response 4 Points 4. Mean: 8. inches (pt) Median: inches (pt) Mode: inches (pt) Range: 0 inches (pt) Student Problems KEY Multiple Choice Point. A After drawing a line of best fit the line is going upward from left to right.. B Process of Elimination: A is out because it left data out. C is out because it had decimals and they are not allowed. D is out because it is not in numerical order.
9 Free Response Points. 000 Pop Year Graph the points on the grid worth ( pt.) Positive Correlation is worth ( pt.) 4. A. Bob is the better golfer because his best score was a 75 and Nancy had a best score of 77. (pt) B. Nancy is the more consistent golfer with an average score of 84.. Bob had an average score of 8.0. (pt) Free Response 4 Point 5. Mean: 4.5 Median: 45.5 Mode: No Mode Range: 4
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