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A market research firm desires to conduct a survey to estimate average amount spent by visitors to in 20.   History tells us the population standard deviation is $398.

a) How large does my random sample size (n) require to be in order to be at the 95% confidence interval?

b) How large does my random sample size (n) require to be in order to be at the 98% confidence interval?

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  • Category:- Statistics and Probability
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