Suppose that in Exercise 8-14 you wanted the total width

Chapter 8, Problem 17E

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QUESTION:

Suppose that in Exercise 8-14 you wanted the total width of the two-sided confidence interval on mean life to be six hours at 95% confidence. What sample size should be used?

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QUESTION:

Suppose that in Exercise 8-14 you wanted the total width of the two-sided confidence interval on mean life to be six hours at 95% confidence. What sample size should be used?

ANSWER:

Step 1 of 2

Given,

Error in estimating the mean life, E = 6 Hrs

CI = 95%

From exercise 8.14, we have

Sample size, n = 20.

The standard deviation,

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