Past experience has indicated that the breaking strength

Chapter 8, Problem 10E

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QUESTION:

Past experience has indicated that the breaking strength of yarn used in manufacturing drapery material is normally distributed and that . random sample of nine specimens is tested, and the average breaking strength is found to be 98 psi. Find a 95% two-sided confidence interval on the true mean breaking strength

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QUESTION:

Past experience has indicated that the breaking strength of yarn used in manufacturing drapery material is normally distributed and that . random sample of nine specimens is tested, and the average breaking strength is found to be 98 psi. Find a 95% two-sided confidence interval on the true mean breaking strength

ANSWER:

Step 1 of 2

Given,

The sample mean,

The standard deviation,

CI = 95%

Sample size, n =9.

For a sample mean, , of a random sample of size n from a normal population with known variance , a  Confidence Interval on  is given by,

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