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Hypothesis test (t-test) regarding a population mean

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Employer A states the average number of days missed by each staff member is 4.0. Office personnel randomly sampled a portion of their attendance records to determine if this claim was accurate. For the previous year, the following data was obtained from the sample group, regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1, 9, 3, 1 and 6. At the .05 level of significance, is there convincing evidence that the number of absences per student has increased?

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This solution shows the details of performing a hypothesis test for a population mean on a single sample (t-test).

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