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A research scientist would like to estimate the tensile strength of a newly created synthetic fiber. He would like to estimate the mean strength to

A research scientist would like to estimate the tensile strength of a newly created synthetic fiber. He

would like to estimate the mean strength to within

2

pounds with

90 %

confidence. In a preliminary

study, he estimates the standard deviation to be

35 .

What sample size should the research scientist

use?

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