Question: 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

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 the sample mean changed when the sample size is?
(a) Increased from 64 to 196?
(b) Decreased from 784 to 49?

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a For n 64 x 568 07 whereas for n 196 x 5614 04 Therefore the varianc... View full answer

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