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The ages of a group of 124 randomly selected adult females have a standard deviation of...

The ages of a group of 124 randomly selected adult females have a standard deviation of 18.5 years. Assume that the ages of female statistics students have less variation than ages of females in the general​ population, so let sigma equals18.5 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics​ students? Assume that we want 90 ​% confidence that the sample mean is within​ one-half year of the population mean.

The required sample size is ____

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TOPIC:Finding the required sample size for the given confidence level and the allowable margin of error.

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