Question: Refer to Exercise 9. a. Find a 90% upper confidence bound for the mean weight. b. Someone says that the mean weight is less than

Refer to Exercise 9.
a. Find a 90% upper confidence bound for the mean weight. 

b. Someone says that the mean weight is less than 1.585 g. With what level of confidence can this statement be made?

Refer to Exercise 9.

In a sample of 80 ten-penny nails, the average weight was 1.56 g and the standard deviation was 0.1 g.

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