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A random sample of 56 credit card holders showed that 41 regularly paid their credit card...

A random sample of 56 credit card holders showed that 41 regularly paid their credit card bills on time.

1 Let P represent the proportion of all people who regularly paid their credit card bills on time.    Find a point estimate P for P ( use decimal form and round to the nearest hundredth).

a. What is the critical value Z used to find a 95% confidence interval?

b.   What is the margin of error EBP? (round to the nearest hundredth)

c. Find a 95% confidence interval for P.

You wish to estimate, with 95% confidence, the population proportion of tablet owners who use their tablets daily. Your estimate must be accurate within 2% of the population proportion.   No preliminary estimate is available. Find the minimal sample size needed.

Math   Statistics-And-Probability   
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