The population can be assumed to be sigma 9 hours. what is, Ask an Expert

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AARP reported on a study conducted to learn how long it takes individuals to prepare their federal income tax return. The data contained in the file named TaxReturn (posted in our course) are consistent with the study results. These data provide the time in hours required for 40 individuals to complete their federal income tax returns. Using past years' data, the population can be assumed to be σ = 9 hours. What is the 95% confidence interval estimate of the mean time it takes an individual to complete a federal income tax return?

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Category:- Statistics and Probability
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