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Past experience has indicated that the breaking strength
Chapter 8, Problem 10E(choose chapter or problem)
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
Questions & Answers
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,