AARP reported on a study conducted of the mean time it takes individuals to
AARP
reported on a study conducted of the mean time it takes individuals to
prepare their federal income tax return. The data contained in the file
named TaxReturn 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
standard deviation can be assumed known with =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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