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Excel Online Structured Activity: Interval Estimation for the Population Mean with σ Known AARP r...

Excel Online Structured Activity: Interval Estimation for the Population Mean with σ Known

AARP reported on a study conducted to learn how long it takes individuals to prepare their federal income tax return (AARP Bulletin, April 2008). The data contained in the Microsoft Excel Online file below are consistent with the study results. These data provide the time in hours required for a sample of 40 individuals to complete their federal income tax returns. Assume that the population standard deviation is known to be σ = 14 hours.

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What is the 95% confidence interval estimate of the mean time it takes an individual to complete a federal income tax return (1 decimal)?

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