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Test the claim that the mean duration of calls

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A telephone company claims that the mean duration of all long-distance phone calls made by its residential customers is 10 minutes. A random sample of 100 long-distance calls made by its residential customers taken from the records for this company showed that the mean duration of calls for this sample is 20 minutes and the standard deviation is 3.8 minutes. At the 0.05 level of significance, test the claim that the mean duration of calls made by residential customers is different from 10 minutes. Use Excel to perform the hypothesis test and upload the Excel file.

Reference no: EM132039756

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