Do 7-9

EXERCISES In Exercises 1-6, is the given value of r reasonable? Give a reason for your answer. 6. r = 0.3 1. r = 1 2. r = 0.7 x 1 2 3 4 5 3.477 5.531 14.88 5.924 8.049 10 10 7. Match the r values with scatter plots in Figure 1.65. NADO r = -0.98, r = -0.5, r=-0.25, r =0, r =0.7, r=1. x 2 4 6 8 10 2 4 6 8 10 (a y y .. . . ... . 3. r = 0.9 X 2 4 6 8 10 2 4 6 8 10 y d V 1000 109 800 NAO OOC TITT 600 400 200 2 4 6 8 10 2 4 6 8 10 . (e) 2 4 8 10 Le N ACOOC wind (d) 4. r = -0.9 2 4 6 8 10 2 4 6 8 10 Figure 1.65 0.8 0.6 8. Table 1.44 shows the number of calories burned per 04 minute by a person walking at 3 mph. 0.2 (a) Make a scatter plot of this data. (b) Draw a regression line by eye. 0.2 0.4 0.6 0.8 1 (c) Roughly estimate the correlation coefficient by eye. 5. r = 0.9 Table 1.44 Body weight (1b) 100 120 150 170 200 220 x 1 2 3 4 5 Calories 2.7 3.2 4.0 4.6 5.4 5.9 3.8 3.2 1.8 1.2 -0.2