Do good smells bring good business? Businesses know that customers often respond to background music. Do they also respond to odors? Nicholas Guéguen and his colleagues studied this question in a small pizza restaurant in France on Saturday evenings in May. On one evening, a relaxing lavender odor was spread through the restaurant; on another evening, a stimulating lemon odor; a third evening served as a control, with no odor. The three evenings were comparable in many ways (weather, customer count, and so on), so we are willing to regard the data as independent SSRs from spring Saturday evenings at this restaurant. Table 25.4 contains data on how long (in minutes) customers stayed in the restaurant on each of the three evenings. Do the groups differ in the average amount of time spent in the restaurant?

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Groups lavender lemon no odor Count 30 28 30 Average 105.7 87.79 91.27 Variance 238.33 222.90