Question

The waiting times (in minutes) of a random sample of 22 people at a bank have a mean of 8.2 minutes and a standard deviation of 3.6 minutes. Assume the population has a normal distribution.

a. Construct, by hand, a 99% confidence interval for the standard deviation of all wait times at this bank.

b. Interpret your confidence interval in context of the data.

Answer #1

b)

true population standard deviation of 99% confidence interval lies between 2.5639 to 5.8205.

The waiting times (in minutes) of a random sample of 22 people
at a bank have a sample standard deviation of 4.2 minutes.
Construct a confidence interval for the population variance sigma
squaredσ2 and the population standard deviation sigmaσ. Use a 90%
level of confidence. Assume the sample is from a normally
distributed population.

The waiting times (in minutes) of a random sample of 21 people
at a bank have a sample standard deviation of 4.7 minutes.
Construct a confidence interval for the population variance σ2 and
the population standard deviation σ Use a 99%
level of confidence. Assume the sample is from a normally
distributed population.
What is the confidence interval for the population variance σ2?
(__,__) (Round to one decimal place as needed.)
What is the confidence interval for the population standard
deviation σ?...

The waiting times (in minutes) of a random sample of 20 people
at a bank have a sample standard deviation of 4.1 minutes.
Construct a confidence interval for the population variance and the
population standard deviation . Use a 90% level of confidence.
Assume the sample is from a normally distributed population.

The waiting times (in minutes) of a random sample of
2020
people at a bank have a sample standard deviation of
4.64.6
minutes. Construct a confidence interval for the population
variance
sigma squaredσ2
and the population standard deviation
sigmaσ.
Use a
95 %95%
level of confidence. Assume the sample is from a normally
distributed population.
What is the confidence interval for the population variance
sigma squaredσ2?
(nothing,nothing)
(Round to one decimal place as needed.)
Interpret the results. Select the correct...

The waiting times (in minutes) of a random sample of 20 people
at a bank have a sample standard deviation of 4.4 minutes.
Construct a confidence interval for the population variance sigma
squared and the population standard deviation sigma. Use a 90 %
level of confidence. Assume the sample is from a normally
distributed population. What is the confidence interval for the
population variance sigma squared? ( nothing, nothing) (Round
to one decimal place as needed.) Interpret the results. Select...

In a random sample of 22 people, the mean commute time to work
was 32.1 minutes and the standard deviation was 7.3 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 99% confidence interval for the population mean μ.
What is the margin of error of μ? Interpret the results.

Queuing theory is the study waiting. Many banks are interested in
the mean amount of time their customers spend waiting on line.
Chase bank says their average wait time is 3 minutes with a
population standard deviation of 1.25 minutes. To prove this the
bank takes a random sample of 1250 people, and finds that their
average time waiting on line is 3.73 minutes.
A) construct a 99% confidence interval estimate for the
population mean waiting time at Fleet.
B)...

A random sample of 16 pharmacy customers showed the waiting
times below (in minutes).
21
22
22
17
21
17
23
20
20
24
9
22
16
21
22
21
Click here for the Excel Data File
Find a 90% confidence interval for μ, assuming that the
sample is from a normal population. (Round your standard
deviation answer to 4 decimal places and t-value to 3 decimal
places. Round your final answers to 3 decimal
places.)
The 90% confidence interval...

In a random sample of 25 people, the mean commute time to work
was 30.6 minutes and the standard deviation was 7.2 minutes.
Assume the population is normally distributed and use a
t-distribution to construct a 95% confidence interval for the
population mean μ.
What is the margin of error of μ? Interpret the results.
1. The confidence interval for the population mean μ is
(_,_)
2. The margin of error of μ is __
3. Interpret the results.
A.It...

In a random sample of 18 people, the mean commute time to work
was 32.4 minutes and the standard deviation was 7.2 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 99% confidence interval for the population mean mu.
What is the margin of error of mu? Interpret the results.

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