Question

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

Answer #1

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The First National Bank of Wilson has 660 checking account
customers. A recent sample of 60 of these customers showed 35 have
a Visa card with the bank. Construct the 99% 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.)
Confidence interval for the
proportion is between
and

The First National Bank of Wilson has 600 checking account
customers. A recent sample of 60 of these customers showed 35 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.

The First National Bank of Wilson has 720 checking account
customers. A recent sample of 60 of these customers showed 22 have
a Visa card with the bank.
Construct the 98% 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.)
Confidence interval for the proportion is between and
.

The First National Bank of Wilson has 740 checking account
customers. A recent sample of 50 of these customers showed 27 have
a Visa card with the bank.
Construct the 99% 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.)

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.)

The First National Bank of Wilson has 660 checking account
customers. A recent sample of 50 of these customers showed 28 have
a Visa card with the bank. Construct the 98% 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.)

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.)

The bank in Cobden, Ontario, has 650 chequing account customers.
A recent sample of 50 of these customers showed 26 to have a Visa
card with the bank.
Construct the 99% confidence interval for the proportion of
chequing account customers who have a Visa card with the bank.
(Round the final answers to 3 decimal places.)
The 99% Confidence interval for the proportion of chequing
account customers is between___and___.

A random sample of 121 checking accounts at a bank showed an
average daily balance of $280. The standard deviation of the
population is known to be $66. Construct a 95% confidence interval
estimates for the mean. (Round to two decimal places) [Answer ,
Answer ] Construct a 99% confidence interval for the mean. (Round
to two decimal places) [Answer , Answer ]

4.1 A recent
survey found that 35 people out of a sample of 410 South Africans
suffer from diabetes. Construct a 95% confidence interval for the
true proportion of all South Africans who suffer from diabetes.
Interpret your answer. (6)
Confidence
Interval
Confidence Level
Z - Limits
90%
± 1.645
95%
±1.96
99%
±2.58

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