The First National Bank of Wilson has 680 checking account customers. A recent sample of 40...
The First National Bank of Wilson has 680 checking account
customers. A recent sample of 40 of these customers showed 27 have
a Visa card with the bank.
Construct the 90% confidence interval for the proportion of
checking account customers who have a Visa card with the bank. (Use
z Distribution Table.) (Round your answers to 3
decimal places.)
Homework Answers
= 27 / 40 =
0.675
1 - = 0.325
Critical value at Alpha = 0.10 = 1.645
The Confidence Interval is given by 
ME,
where
The Lower Limit = 0.675 - 0.122 = 0.553
The Upper Limit = 0.675 + 0.122 = 0.797
The 90% Confidence Interval is (0.553 , 0.797)
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The First National Bank of Wilson has 680 checking account
customers. A recent sample of 40...
The First National Bank of Wilson has 680 checking account customers. A recent sample of 60...
The First National Bank of Wilson has 680 checking account customers. A recent sample of 60 of these customers showed 21 have a Visa card with the bank. Construct the 90% confidence interval for the proportion of checking account customers who have a Visa card with the bank. (Use z Distribution Table.) (Round your answers to 3 decimal places.)
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