An Internal Revenue Service auditor ran a test on a sample of income tax returns filed in two successive years to check whether the average refund for taxpayers is larger this year compared to the last. The mean and standard deviation for last year’s and this year’s samples are as given below: Test whether the average refund increased this year compared to the last.
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Test whether the average refund increased this year compared to the last. was first posted on February 7, 2019 at 9:59 pm.
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