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Out of 650 customers at grocery store chain, 0.63 used a debit card.  Create a 90% confidence...

Out of 650 customers at grocery store chain, 0.63 used a debit card.  Create a 90% confidence interval around the sample proportion.   (Round Z to three decimals. Treat the proportions as decimals and go to 4 places)

-What is the absolute value of the Z-score representing the lower and upper boundaries of the interval? Be sure to use the positive value.  

-What is the standard error of the proportion? (To 4 decimals)

-What is the value of the lower boundary of the confidence interval?

-What is the value of the upper boundary of the confidence interval?

Math   Statistics-And-Probability   
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