Find the sample size needed to estimate the mean age of movie patrons such that it can be said with 90​% confidence that the sample mean is within 3 years of the population mean. Assume that sigmaequals19.3 ​years, based on a previous report.
Should the sample be obtained from one movie at one​ theater?
A. The sample should not be obtained from one movie at one​ theater, because that sample could be easily biased.​ Instead, a cluster sample of the broader population should be obtained.
B. The sample should be obtained from one movie at one​ theater, because that sample is representative of the population.
C. The sample should not be obtained from one movie at one​ theater, because that sample could be easily biased.​ Instead, a stratified sample of the broader population should be obtained.
D. The sample should not be obtained from one movie at one​ theater, because that sample could be easily biased.​ Instead, a simple random sample of the broader population should be obtained.