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Find the sample size: We desire to be within plus or minus 4 units. We will have a 95% confidence interval and the population standard deviation is 15. What is the estimated sample size?

A. the estimated sample size lies between 0 and 10

B. the estimated sample size lies between 11 and 20

C. the estimated sample size lies between 21 and 30

D. the estimated sample size lies between 31 and 40

E. the estimated sample size lies between 41 and 60

 

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