Solved: A certain type of thread is manufactured with a
Chapter 9, Problem 8.19(choose chapter or problem)
A certain type of thread is manufactured with a mean tensile strength of 78.3 kilograms and a standard deviation of 5.6 kilograms. How is the variance of thesample mean changed when the sample size is (a) increased from 64 to 196? (b) decreased from 784 to 49?
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