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Find out the minimum needed sample size if you want to be 95% confident that sample mean is in two units of true population mean. Suppose that sigma = 7.8 and that the population is normally distributed.

A. n = 14

B. n = 30

C. n = 55

D. n = 59

E. n = 67

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  • Category:- Statistics and Probability
  • Reference No.:- M921987

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