7.5 – In the exercise below, assume that the sample is a simple random sample ob
ID: 3131977 • Letter: 7
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.