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# Confidence Interval Construction

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Question:
June Walker is the Director of the Annual Fund for Marine Life University. She asks her analyst to study the giving patterns of the alumni of the School of Marine Sciences. Her analyst collects a random sample of 44 records and calculates an average annual participation in the Fund of 10.455 years. The standard deviation for annual participation is calculated to be 7.7 years. Based on this information, construct a 90% confidence interval for the average number of years of participation for the annual fund.

##### Solution Summary

This solution constructs a 90% confidence interval for the average number of years of participation for the annual fund.

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Here is my explanation:

The critical value for the 90% confidence interval is 1.68 ( In this ...

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