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.

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Number Time to of Carts Check Out 14 βο and βι