Week 1 Chapter 9 and Review - Chapter 9 Review 1 In an article it was claimed that the typical supermarket trip takes a mean of 22 minutes In an effort

Week 1 Chapter 9 and Review - Chapter 9 Review 1 In an...

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Chapter 9 Review 1. In an article it was claimed that the typical supermarket trip takes a mean of 22 minutes. In an effort to test this claim, you select a random sample of 50 shoppers. The mean shopping time for this sample was 25.36 minutes with a standard deviation of 7.24 minutes. Using the 0.1 level of significance, is there evidence that the mean shopping at this supermarket is different from the claimed value of
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Unformatted text preview: 22 minutes? 2. A fast food chain has just developed a new process to make sure that orders at the drive-through are filled correctly. The previous process filled orders correctly 85% of the time. A sample of 100 orders using the new process is selected and 94 were filled correctly. At the 0.01 level of significance, can you conclude that the new process has increased the proportion of orders filled correctly?...
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