14.23 Waiting for a Prescription How long do you wait to have your prescriptions filled? According to a survey, "about 3 in 10 Canadians wait more than 20 minutes to have a prescription filled." Suppose a comparison of waiting times for pharmacies in supermarkets and pharmacies in drugstores produced the following results.

a. Is there sufficient evidence to indicate that there is a difference in waiting times for pharmacies in supermarkets and pharmacies in drugstores? Use a = 0.01.

b. If we consider only if the waiting time is more than 20 minutes, is there a significant difference in waiting times between pharmacies in supermarkets and pharmacies in drugstores at the 1% level of significance?

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Waiting Time Supermarket Drugstore 15 minutes 75 119 16-20 minutes 44 21 > 20 minutes 21 37 Don't know 10 23