2 in an article nanci hellmich supermarket guru has a, Ask an Expert

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2. In an article (Nanci Hellmich, " 'Supermarket Guru' Has a Simple Mantra," USA Today, June 19, 2002, 70) it was claimed that the typical supermarket trip takes a mean of 22 minutes. Suppose that in an effort to test this claim, you select a sample of 50 shoppers at a local supermarket. The mean shopping time for the sample of 50 shoppers was 25 minutes with a standard deviation of 8 minutes. Using the 0.05 level of significance, is there evidence that the mean shopping time at the local supermarket is different from the claimed value of 22 minutes? Use a one-sample hypothesis test.

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