She marketing manager used shelf space for pet food to predict weekly sales. The data are stored

Question:

She marketing manager used shelf space for pet food to predict weekly sales. The data are stored in Pet food. From the results of that problem, b1 = 7.4 and Sbl = 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.
For Information: Problem 13.4