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45 people are randomly selected and the accuracy of their wristwatches is checked, with positive errors...

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Basic Math

45 people are randomly selected and the accuracy of theirwristwatches is checked, with positive errors representing watchesthat are ahead of the correct time and negative errors representingwatches that are behind the correct time. The 45 values have a meanof 96sec. Assume a population standard deviation of 232sec. Use a0.02 significance level to test the claim that the population ofall watches has a mean of 0sec (use a two-sided alternative).

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