7.5 – In the exercise below, assume that the sample is a simple random sample ob

Question

7.5 – In the exercise below, assume that the sample is a simple random sample obtained from a normally distributed population. Use table 7.2 to find the indicated sample size.

CVS Pharmacy Wait Times. You want to estimate ? for the population of waiting times at CVS’s drive-up pharmacy, and you want to be 95% confident that the sample standard deviation is within 20% of ?. Find the minimum sample size. Is this sample size practical? Use the sample size determination table to answer this question.

Explanation / Answer

From the table we find that the minimum sample size should be 48. This is practical sample size, as it is not very big.

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