45 people are randomly selected and the accuracy of their wristwatches is checked, with positive errors representing watches that are ahead of the correct time and negative errors representing watches that are behind the correct time. The 45 values have a mean of 113sec. Assume the population standard deviation is known to be 226sec. Use a 0.01 significance level to test the claim that the population of all watches has a mean of Osec. Give your test statistic to 3 decimal places, and your P-value to at least 4 decimal places. Hint: Is there a direction specified in the problem statement? What does that tell you about your alternate hypothesis? The test statistic is

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45 people are randomly selected and the accuracy of their wristwatches is checked, with positive errors representing watches that are
ahead of the correct time and negative errors representing watches that are behind the correct time. The 45 values have a mean of 113sec.
Assume the population standard deviation is known to be 226sec. Use a 0.01 significance level to test the claim that the population of all
watches has a mean of Osec. Give your test statistic to 3 decimal places, and your P-value to at least 4 decimal places. Hint: Is there a direction
specified in the problem statement? What does that tell you about your alternate hypothesis?
The test statistic is
The P-Value is
Transcribed Image Text:45 people are randomly selected and the accuracy of their wristwatches is checked, with positive errors representing watches that are ahead of the correct time and negative errors representing watches that are behind the correct time. The 45 values have a mean of 113sec. Assume the population standard deviation is known to be 226sec. Use a 0.01 significance level to test the claim that the population of all watches has a mean of Osec. Give your test statistic to 3 decimal places, and your P-value to at least 4 decimal places. Hint: Is there a direction specified in the problem statement? What does that tell you about your alternate hypothesis? The test statistic is The P-Value is
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