Question: Suppose that in Problem 9.14, the standard deviation is 120 hours. a. Repeat (a) through (d) of Problem 9.14, assuming a standard deviation of 120

Suppose that in Problem 9.14, the standard deviation is 120 hours.
a. Repeat (a) through (d) of Problem 9.14, assuming a standard deviation of 120 hours.
b. Compare the results of (a) to those of Problem 9.14.
In problem 9.14
a. At the 0.05 level of significance, is there evidence that the mean life is different from 375 hours?
b. Compute the p-value and interpret its meaning.
c. Construct a 95% confidence interval estimate of the population mean life of the light bulbs.
d. Compare the results of (a) and (c). What conclusions do you reach?

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