Students randomly selected 30 people and measured the accuracy of their wristwatches, with positive errors representing watches
Question:
Students randomly selected 30 people and measured the accuracy of their wristwatches, with positive errors representing watches that were ahead of the correct time and negative errors representing watches that were behind the correct time. The 30 values have a mean of 117.3 seconds and a standard deviation of 185.0 seconds. Use a 0.05 significance level to test the claim that the population of all watches has a mean equal to 0 seconds. What can be concluded about the accuracy of people's wristwatches?
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