In Problem 13.4 on page 531, the marketing manager used shelf space for pet food to predict weekly sales. The data are stored in Petfood. From the results of that problem, b1 = 7.4 and Sb1 = 1.59.
a. At the 0.05 level of significance, is there evidence of a linear relationship between shelf space and sales?
b. Construct a 95% confidence interval estimate of the population slope, β1.