Question: A machine produces metal rods used in an automobile suspension system. A random sample of 15 rods is selected, and the diameter is measured. The resulting data (in millimeters) are as follows:

8.24 8.25 8.20 8.23 8.24

8.21 8.26 8.26 8.20 8.25

8.23 8.23 8.19 8.28 8.24

1. Check the assumption of normality for rod diameter
2. Calculate the 95% two-sided confidence interval on mean rod diameter
3. Calculate a 95% upper confidence bound on the mean. Compare this bound with the upper bound of the two-sided confidence interval.

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Solution: The downloadable solution consists of 4 pages
Deliverable: Word Document