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An automobile assembly line operation has a scheduled mean completion time,u , of 12.6 minutes. The standard deviation of completion times is 1.8 minutes. It is claimed that, under new management, the mean completion time has decreased. To test this claim, a random sample of 48 completion times under new management was taken. The sample had a mean of 12.5 minutes. Assume that the population is normally distributed. Can we support, at the 0.1 level of significance, the claim that the mean completion time has decreased under new management? Assume that the standard deviation of completion times has not changed.
Perform a one-tailed test. Then fill in the table below.
The null hypotheses is:
The alternative hypothesis is:
Type of test statistic:
The value of the test statistic (round to at least three decimal places):
The p-value (round to at least three decimal places):
Can we support the claim that the mean completion time has decreased under new management?
A technician services machines as companies in the Phoenix area. Depending on the type of malfunction, the service call can take exactly 1, 2, 3, or 4 hours. The different types of malfunctions occur at the same frequency.
Find out 90% confidence interval for mean grade of all the students in the class.
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The results of the simple linear regression are provided below.
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Create a histogram showing the distribution of symptom scores in this sample. Is this a skewed distribution? If so, is it skewed to the left or to the right?
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