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    One sample t test for comparing mean

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    A report states that employees spend, on average, 80 minutes every working day on personal use of the Internet. A company takes a random sample of 100 employees and finds their mean personal Internet use is 83 minutes with a standard deviation of 15 minutes. The company's managing director claims that his employees spend more time on average on personal use of the Internet than the report states.

    Test, at the 5% level of significance, the managing director's claim. State your hypotheses clearly.

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    This solution contains a step by step method for computing test statistic for one sample t test for comparing mean.