50 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 50 values have a mean
of 102sec and a standard deviation of 205 sec. Use a 0.01
significance level to test the claim that the population of all
watches has a mean of 0 sec.
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 50 values have a mean
of 102sec and a standard deviation of 205 sec. Use a 0.01
significance level to test the claim that the population of all
watches has a mean of 0 sec.
The test statistic is
The p-value is
The final conclusion is
A. There is not sufficient evidence to warrant rejection of
the claim that the mean is equal to 0
the claim that the mean is equal to 0
B. There is sufficient evidence to warrant rejection of the
claim that the mean is equal to 0
claim that the mean is equal to 0
