Suppose that in Exercise 8-15 it is desired to estimate

Chapter 8, Problem 18E

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QUESTION:

Suppose that in Exercise 8-15 it is desired to estimate the compressive strength with an error that is less than 15 psi at 99% confidence. What sample size is required?

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QUESTION:

Suppose that in Exercise 8-15 it is desired to estimate the compressive strength with an error that is less than 15 psi at 99% confidence. What sample size is required?

ANSWER:

Step 1 of 2

Given,

Error in estimating the mean life, E = 15 psi

CI = 99%

From exercise 8.15, we have

The standard deviation,

Sample size, n = 12.

The mean,

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