In a simple linear regression analysis attempting to link lottery sales (y) to jackpot amount

(x), the following data are available:

x y

jackpot($millions) Sales(millions)

12 60

14 70

6 40

8 50

The slope (b) of the estimated regression equation here is 3.5. The intercept (a) is 20.

Produce the 95% confidence interval estimate of the population slope, , and report the

upper bound for the interval.

A. 5.02

B. 4.66

C. 7.23

D. 3.72