You Are Attempting to Link Weekly Hours of Exercise (X)

Multiple Choice

You are attempting to link weekly hours of exercise (x) to blood pressure (y) using simple linear regression and the following data: In applying the least squares criterion, the slope (b) and the intercept (a) for the best-fitting line are b = -4 and a = 90.Produce the 95% confidence interval estimate of expected blood pressure when weekly exercise is 5 hours (that is, for x = 5) and report the upper bound for the interval.

A) 85.6
B) 70.0
C) 111.8
D) 93.2
E) 78.3