8.19 A certain type of thread is manufactured with amean tensile strength of 78.3 kilograms and a standarddeviation 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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Answered: 8.19 A certain type of thread is…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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8.19 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?