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The mean shopping time for women with kids is 7.3 minutes. A random sample of women with children in a shopping store gave the following shopping times in minutes:

7.7 8.1 8.2 9.0 5.8 9.3 8.4 6.9 12.1 9.4

8.1 6.2 7.3 7.9 8.2 8.5 7.2 6.3 9.1 8.8

a) Verify that mean=8.1 minutes and s=1.4 min

b) Assume the shopping time followed an approximately normal distribution. Use a 5% level of significance to test the claim that the average shopping time foe women with children in Carson mall is higher than the national average for this type of store.

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Statistics and Probability, Statistics

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