# Sample Size

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Average life span of mice extended by as much as 26% when the calories in their food are reduced. Assume normality and the statistics below:

Confidence = 97% St. dev= 8.0 months

How large a sample size is needed to detect a difference of 2.5 months from the expected value?

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The solution provides step by step method for the calculation of sample size. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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Sample size

Average life span of mice extended by as much as 26% when the calories in their food are reduced. Assume normality and the statistics below:

Confidence ...

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