To investigate the relationship between yield of potatoes, y, and level of fertilizer application, x, a researcher divides a field into eight plots of equal size and applies differing amounts of fertilizer to each. The yield of potatoes (in pounds) and the fertilizer application (in pounds) are recorded for each plot. The data are as follows: x |1 1.5 2 2.5 3 3.5 4 4.5 25 31 27 28 36 35 32 34 Construct a scattergram for the data. What does the scattergram suggest about the relationship between x and y? a. b. C. Find the least squares estimates of Bo and B1. d. Plot the least squares line on your scattergram. Does the line appear to fit the data well?

5x – 2 d.x x2 + 1 10.)

Emily is a fifth-grade student who completed a standardized reading test. She scored one standard deviation above the mean score. Answer the following questions: How does the normal curve help you understand what this means about how Emily compared to other children who took the test? Explain how you determined your findings. How many children scored lower than Emily? How many children scored higher?

10. If CD = 5x – 2 and AB = 2x + 18, find %3D AB F 五