Question

As part of an annual review of its accounts, a discount
brokerage selects a random sample of 31 customers. Their accounts
are reviewed for total account valuation, which showed a mean of
$34,500, with a sample standard deviation of $9,050. (Use
*t* Distribution Table.)

What is a 95% confidence interval for the mean account valuation
of the population of customers? **(Round your answers to the
nearest dollar amount.)**

**95% confidence interval for the mean account valuation
is between _____ and _____**

Answer #1

As part of an annual review of its accounts, a discount
brokerage selects a random sample of 31 customers. Their accounts
are reviewed for total account valuation, which showed a mean of
$33,900, with a sample standard deviation of $8,700. (Use
t Distribution Table.)
What is a 99% confidence interval for the mean account valuation
of the population of customers? (Round your answers to the
nearest dollar amount.)

As part of an annual review of its accounts, a discount
brokerage selects a random sample of 28 customers. Their accounts
are reviewed for total account valuation, which showed a mean of
$33,400, with a sample standard deviation of $8,650. (Use t
Distribution Table.)
What is a 98% confidence interval for the mean account valuation
of the population of customers? (Round your answers to the nearest
dollar amount.) 98% confidence interval for the mean account
valuation is between $ and...

As part of an annual review of its accounts, a discount
brokerage selects a random sample of 28 customers. Their accounts
are reviewed for total account valuation, which showed a mean of
$34,600, with a sample standard deviation of $8,650. (Use t
Distribution Table.)
What is a 98% confidence interval for the mean account valuation
of the population of customers? (Round your answers to the nearest
dollar amount.)

A local bank needs information concerning the savings account
balances of its customers. A random sample of 15 accounts was
checked. The mean balance was $586.75 with a standard deviation of
$256.20. Find a 95%confidence interval for the true mean. Assume
that the account balances are normally distributed. Round to the
nearest cent.
A) Determine the confidence interval.
B) Would it be unusual to have a sample of 15 customer to have
an average balance less than $400.00? Explain your...

A regional U.S. commercial bank issues both Visa and MasterCard
credit cards. As a part of its annual review of the profitability
of each type of credit card, the bank randomly samples 24 customers
to measure the average quarterly charges per card. It has completed
its analysis of the Visa card accounts and is now focused on its
MasterCard customers. A random sample of 24 MasterCard accounts
shows the following spending per account (rounded to the nearest
dollar):
$2,869
$2,549...

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 ]

A large hospital wholesaler, as part of an assessment of
workplace safety, gave a random sample of 54 of its warehouse
employees a test (measured on a 0 to 100 point scale) on safety
procedures. For that sample of employees, the mean test score was
75 points, with a sample standard deviation of 15 points. Determine
and interpret a 95% confidence interval for the mean test score of
all the company’s warehouse employees. (Please keep at least four
decimal places)....

A simple random sample of 50 customers is selected from an
account receivable portfolio and the sample mean account balance is
$1000. The population standard deviation σ is known to be $200.
(8 points)
Construct a 95% confidence interval for the mean account
balance of the
population.
What is the margin of error for estimating the mean account
balance at the
95% confidence level?
Construct a 95% confidence interval for the mean account
balance of the population if the sample...

A savings and loan association needs information concerning the
checking account balances of its local customers. A random sample
of 14 accounts was checked and yielded a mean balance of $664.14
and a standard deviation of $297.29. Find a 95% confidence interval
for the true mean checking account balance for local customers.
Use the given degree of confidence and sample data to construct
a confidence interval for the population mean μ. Assume that the
population has a normal distribution. Round...

A random sample of 20 purchases showed the amounts in the table
(in $). The mean is $49.64 and the standard deviation is $23.80.
a) Construct a 98% confidence interval for the mean purchases of
all customers, assuming that the assumptions and conditions for
the confidence interval have been met. b) How large is the margin
of error? c) How would the confidence interval change if you had
assumed that the standard deviation was known to be $24?

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