21.38 Do Good Smells Bring Good Business? In Exercise 21.9, you examined the effects of a lavender odor on customer behavior in a small restaurant. Lavender is a relaxing odor. The researchers also looked at the effects of lemon, a stimulating odor. The design of the study is described in Exercise 21.9. Here are the times, in minutes, that customers spent in the restaurant when no odor was present: L.Ili ODORS3 103 TO 106 72 121 115 107 107 118 101 75 When a lemon odor was present, customers lingered for these times: TE 104 75 112 109 101 89 106 113 a. Examine both samples. Does it appear that use of two-sample f procedures is justified? Do the sample means suggest that a lemon odor changes the average length of stay? b. Does a lemon odor influence the length of time customers stay in the restaurant? State the hypotheses, carry out a f test, and report your conclusions