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practice - These are some practice questions The...

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These are some practice questions. The calculations here are much longer than the test because you have the access of computer at home. Question 1: A certain daily delievery route for Hostess breads and snack cakes includes eight grocery stores and four convenience stores. The historical mean time of complete the deliveries to all the stores and return to the distribution center is 6.5 hours. A new driver has been assigned to this route and a random sample of his route completion times (in hours) was obtained and they are: 6 . 61 6 . 25 6 . 40 6 . 57 6 . 35 5 . 95 6 . 53 6 . 29 Is there any evidence to suggest that the new driver has been able to shorten the route completion time? State all the necessary assumption. Question 2: In order to help retailers plan ahead, each year a study is conducted to determine how much people intend to spend on holiday gifts. In a November 2008 survey, a sample of shoppers was obtained and they were asked to estimate their planned holiday spending (in dollars). Consider the summary statistics given in the following table:
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