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What is the population mean of mary

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Reference no: EM132413723

Problem: Mary recently took over as Director of the local YMCA. She wants to understand their current membership including how long they have been members of the YMCA. She selects a random sample of 40 current members and finds their mean duration of membership is 8.32 years. The historical standard deviation of this data is 3.07.

Required:

Question 1: What is the population mean?

Question 2: What is 90% confidence interval for the population mean?

Question 3: The previous Director's report had indicated that the mean duration of membership had increased to almost 10 years. Does Mary's sample information substantiate this claim?

Reference no: EM132413723

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