Question: A random sample of size n = 64 was drawn from a normally distributed population with known standard deviation and a 90% confidence interval was

A random sample of size n = 64 was drawn from a normally distributed population with known standard deviation and a 90% confidence interval was calculated.

How large would the sample have to be to reduce the width of the 90% confidence interval by 20%?

a) n = 36 (wrong!) b) n = 77 (wrong!) c) n = 81 d) n = 100 e) n = 128

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