Refer to Exercise 11.25.
(a) What proportion of the y variability is explained by the linear regression on x?
(b) Find the sample correlation coefficient.
Exercise 11.25
We all typically go to the shortest line in the grocery store. Data were collected on the number of carts ahead in line and the total time to check out (minutes), including time in line, on five occasions.

(b) Test H0: β1 = 0 versus H1: β1 ‰  0 with a = .05.
(c) Estimate the expected y value corresponding to x = 3 carts and give a 90% confidence interval

Transcribed Image Text:

Number Time to of Carts Check Out 14 βο and βι