Mathematics, 26.03.2020 19:57 kedjenpierrelouis
Past experience has indicated that the breaking strength of yarn used in manufacturing drapery material is normally distributed with a standard deviation of 3 psi. A random sample of 9 specimens is tested, and the average breaking strength is found to be 97 psi. a) Find a 95% two-sided confidence interval on the true mean breaking strength. b) Find a 95% lower bound confidence interval on the true mean breaking strength.
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