Marketing: Shopping Time How much a customer buys is a direct result of how much time they spend in a store. A study of average shopping times in a large chain store gave the following information:

Shopping alone: 18 min.

Shopping with a family: 32 min.

Suppose you want to set up a statistical test to challenge the claim that people who shop alone spend, on average, 18 minutes shopping in a store.

(a) What would you use for the null and alternate hypotheses if you believe the average shopping time is less than 18 minutes? Is this a right-tailed, left-tailed, or two-tailed test?

(b) What would you use for the null and alternate hypotheses if you believe the average shopping time is different from 18 minutes? Is this a righttailed, left-tailed, or two-tailed test?

Stores usually find ways to engage the interest of shoppers by setting up activities—perhaps demonstrations, free samples, and/or opportunities to test the products.

These are particularly enticing to families with children who have a tendency to be very curious. Suppose these activities were set up in a store and you now wish to challenge the claim that a person shopping with a family spends on average 32 minutes shopping in a chain store.

(c) What would you use for the null and alternate hypotheses if you believe the average shopping time is more than 32 minutes? Is this a right-tailed, left-tailed, or two-tailed test?

(d) What would you use for the null and alternate hypotheses if you believe the average shopping time is different from 32 minutes? Is this a righttailed, left-tailed, or two-tailed test?

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