solution

The Cherry Manufacturing Company’s chief engineer examines a random

sample of 10 spot welds of steel. In each case, the shear strength of the weld

and the diameter of the weld are determined, the results being as follows:

Does the relationship between these two variables seem to be direct or

inverse? Does this accord with common sense? Why or why not? Does the

relationship seem to be linear? Calculate the least-squares regression of shear strength on weld

diameter. c. Plot the regression line. Use this regression line to predict the average

shear strength of a weld ¹ 5 inch in diameter. Use the regression line to

predict the average shear strength of a weld ¼ inch in diameter.