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Question

The operations manager of a plant making cellular telephones has proposed rearranging the production process to be more efficient. She wants to estimate the time to assemble the telephone using the new arrangement. She believes that the population standard deviation is 15 seconds. How large a sample of workers should she take to estimate the mean assembly time to within 2 seconds with 95% confidence?

Solution

VerifiedAnswered 9 months ago

Answered 9 months ago

Step 1

1 of 5Recall that the formula to determining the sample size to estimate a mean is

$n = \left( \dfrac{z_{\alpha/2} \cdot \sigma}{B}\right)^2$

where $B$ is the bound on the error of the estimate.

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