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A sample of parts was taken from a population of finished parts that had U =...

A sample of parts was taken from a population of finished parts that had U = 470, O=18. The sampling distribution for Xbar was found (using the CLT) to be normal with mean 470 and standard error 2. What was the sample size?

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Answer #1

Solution :

Given that,

mean = = 470

standard deviation = = 18

= = 470

= 2

n = ( /   )2

n = ( 18 / 2 )2

sample size = n = 81

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