Question: Find the 90% confidence interval for the data in Example 9-7. Example 9-7 A dietitian wishes to see if a person's cholesterol level will change

Find the 90\% confidence interval for the data in Example 9-7.

Example 9-7

A dietitian wishes to see if a person's cholesterol level will change if the diet is supplemented by a certain mineral. Six randomly selected subjects were pretested, and then they took the mineral supplement for a 6-week period. The results are shown in the table. (Cholesterol level is measured in milligrams per deciliter.) Can it be concluded that the cholesterol level has been changed at $\alpha=0.10$ ? Assume the variable is approximately normally distributed.

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