SOLUTION: A partner company to American Intellectual Union (AIU), Universal Credit Inc., would like to examine the required sample size needed to be able to estimate the mean dollars that ea

Question 464424: A partner company to American Intellectual Union (AIU), Universal Credit Inc., would like to examine the required sample size needed to be able to estimate the mean dollars that each card holder will spend each month. It would like to be within plus or minus $55 of the true mean with a 95% confidence level. The standard deviation is thought to be $700. How many card holders should be sampled? Your company charges a set dollar amount for each account in the sample.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A partner company to American Intellectual Union (AIU), Universal Credit Inc., would like to examine the required sample size needed to be able to estimate the mean dollars that each card holder will spend each month. It would like to be within plus or minus $55 of the true mean with a 95% confidence level. The standard deviation is thought to be $700. How many card holders should be sampled? Your company charges a set dollar amount for each account in the sample.
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n = [z*s/E]^2
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= [1.96*700/55]^2
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= 623 when rounded up
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Cheers,
Stan H.
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