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Sample Size for the Estimation of Mean for Elephants

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In a study of elephants a researcher wishes to determine the average weight of a certain subspecies of elephants. From previous studies, the standard deviation of the weights of elephants in this subspecies is known to be 1500 pounds. How many elephants does the researcher need to weigh so that he can be 80% confident that the average weight of elephants in his sample is within 350 pounds of the true average weight for this subspecies?

A. 31
B. 39
C. 50
D. 166

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Solution Summary

The solution provides step by step method for the calculation of sample size for the estimation of mean. Formula for the calculation and Interpretations of the results are also included.

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