Question: 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

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 samble of 40 individuals to complete their federal income tax returns. Assume that the population standard deviation is

known to be o = 11 hours.

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