Time required to prepare a federal
income tax return
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 are consistent with the
study results. These data provide the time in hours required of 40 individuals
to complete their federal income tax return. Using past years’ data, the
population standard deviation can be assumed known with standard deviation = 9
hours.
What is the 95% confidence
interval estimate of the mean time it takes an individual to complete a federal
income tax return (to 1 decimal)?
__________ _______________ hours
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