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Wachovia Bank has 800 checking account customers. A recent sample of 60 of these showed 35...

Wachovia Bank has 800 checking account customers. A recent sample of 60 of these showed 35 to have a Visa card with the bank.

Construct the 99% confidence interval for the proportion of checking account customers who have a Visa with the bank.

b. What sample size would be needed if you want the estimated proportion to be within 4% of the population proportion at the 99% confidence level?

if possible draw distributions?

Thanks in advance

Math   Statistics-And-Probability   
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