Organizing Data Answers

Determine whether the graph shows a positive correlation, a negative correlation, or no correlation. If there is a positive or negative correlation, describe its meaning in the situation. Determine whether a scatter plot of the data for the following situation might show a positive, negative, or no relationship. Explain your answer.

The following scatter plot depicts the number of chicken pox cases after 1988. The variable x represents the number of years after 1988. The variable y represents the number of cases in thousands. Does there appear to be a linear relationship? Explain your answer.

Determine whether the graph shows a positive correlation, a negative correlation, or no correlation. If there is a positive or negative correlation, describe its meaning in the situation. Strawberries Picked Time (hours)

The following scatter plot shows the billions of dollars spent by travelers in the United States since 1993. Which table most accurately organizes the data from the graph? Table A Years from 1993 0 1 1.5 2 3 4 5 Amount ($ billions) 320 340 350 360 380 400 420 Table B Years from 1993 0 1 1.5 2 3 4 5 6 Amount ($ billions) 320 340 350 360 380 400 420 440 Table C Years from 1993 320 340 350 360 380 400 420 440 Amount ($ billions) 0 1 1.5 2 3 4 5 6 Table D Years from 1993 320 340 350 360 380 400 420 Amount ($ billions) 0 1 2 3 4 5 6

Eight people of various ages were polled and asked to estimate the number of CDs they had bought in the previous year. The following scatter plot depicts the information collected. The variable x represents the age. The variable y represents the number of CDs.. Determine which table would have been used to make the scatter plot and decide if there is a linear relationship between the age of a person and the amount of CDs purchased. Table A Age, x Number of CDs, y 18 12 20 17 24 10 25 6 28 4 30 4 32 2 34 3 Table B Number of CDs, x Age, y 18 12 20 17 24 10 25 6 28 4 30 4 32 2 34 3

The following is a scatter plot of the heights and weights of the students in Mr. Baldwin’s PE class. Which of the following tables most accurately organizes the data used with for the scatter plot? Table A Weight 120 125 130 135 140 145 150 155 160 165 170 175 180 Height 62 63 64 67 68 69 70 68 71 72 74 75 73 Table B Weight 120 122 126 130 135 152 160 165 170 175 180 185 190 Height 63 62 64 67 68 69 70 68 71 72 74 75 73 Table C Weight 120 122 126 130 135 152 160 165 170 175 180 185 190 Height 60 62 64 66 68 70 72 74 76 78 80 82 84 Table D Height 120 122 126 130 135 152 160 165 170 175 180 185 190 Weight 60 62 64 66 68 70 72 74 76 78 80 82 84

Use the scatter plot of car resale values to answer the following question. What can you say about the correlation between the age of a car and its resale value?

The scatter plot shows the study time and test scores for the students in Mrs. Johnson’s English Literature class. Which of the following is an appropriate score for a student who studies for 1.5 hours?

The scatter plot shows the study time and test scores for the students in Mrs. Johnson’s English Literature class. Which table most accurately organizes the data from the scatter plot? Table A Study Time (min) 10 30 45 60 60 75 90 91 114 120 Test Scores 65 76 74 78 85 68 95 92 75 98 Table B Study Time (min) 10 20 30 40 50 60 70 80 90 100 Test Scores 65 76 74 78 85 68 95 92 75 98 Table C Study Time (min) 65 76 74 78 85 68 95 92 75 98 Test Scores 10 20 30 40 50 60 70 80 90 100 Table D Study Time (min) 65 76 74 78 85 68 95 92 75 98 Test Scores 10 30 45 60 60 75 90 91 114 120