Question

A sample of 22 items provides a sample standard deviation of 6.

(a)

Compute the 90% confidence interval estimate of the population variance. (Round your answers to two decimal places.)

________ to _________

(b)

Compute the 95% confidence interval estimate of the population variance. (Round your answers to two decimal places.)

________ to _______

(c)

Compute the 95% confidence interval estimate of the population standard deviation. (Round your answers to one decimal place.)

________ to _________

Answer #1

A sample of 20 items provides a sample standard
deviation of
5.
a. Compute the 90% confidence interval estimate of the population
variance.
b. Compute the 95% confidence interval estimate of the population
variance.
c. Compute the 95% confidence interval estimate of the
population variance.

A simple random sample of 70 items resulted in a sample mean of
80. The population standard deviation isσ = 15.(a)Compute the 95% confidence interval for the population mean.
(Round your answers to two decimal places.)to(b)Assume that the same sample mean was obtained from a sample of
140 items. Provide a 95% confidence interval for the population
mean. (Round your answers to two decimal places.)to(c)What is the effect of a larger sample size on the interval
estimate?A larger sample size...

A simple random sample of 40 items resulted in a sample mean of
30. The population standard deviation is σ = 20. a. Compute the 95%
confidence interval for the population mean. Round your answers to
one decimal place. Assume that the same sample mean was obtained
from a sample of 100 items. Provide a 95% confidence interval for
the population mean. Round your answers to two decimal places. What
is the effect of a larger sample size on the...

Exercise 1. Suppose a random sample of 22 items produces a
sample standard deviation of 16.
Develop a 90% confidence interval estimate for the population
variance.

A random sample of 23 items is drawn from a population whose
standard deviation is unknown. The sample mean is x¯x¯ = 770 and
the sample standard deviation is s = 25. Use Appendix D to
find the values of Student’s t.
(a) Construct an interval estimate of μ
with 95% confidence. (Round your answers to 3 decimal
places.)
The 95% confidence interval is from to
(b) Construct an interval estimate of μ
with 95% confidence, assuming that s =...

A random sample of 125 items is drawn from a population whose
standard deviation is known to be σ = 30. The sample mean
is x¯ = 860.
(a)
Construct an interval estimate for μ with 95 percent
confidence. (Round your answers to 1 decimal
place.)
The 95% confidence interval is from _________ to
__________
(b)
Construct an interval estimate for μ with 95 percent
confidence, assuming that σ = 60. (Round your answers to 1
decimal place.)
The 95% confidence...

A random sample of 24 items is drawn from a population whose
standard deviation is unknown. The sample mean is x¯ = 870 and the
sample standard deviation is s = 25. Use Appendix D to find the
values of Student’s t.
(a) Construct an interval estimate of μ with 98% confidence.
(Round your answers to 3 decimal places.) The 98% confidence
interval is from to
(b) Construct an interval estimate of μ with 98% confidence,
assuming that s =...

A simple random sample of 90 items from a population with ? = 7
resulted in a sample mean of 31. If required, round your answers to
two decimal places.
a. Provide a 90% confidence interval for the
population mean.
______ to ______
b. Provide a 95% confidence interval for the
population mean.
_____ to _____
c. Provide a 99% confidence interval for the
population mean.
_____ to _____

A random sample of 51 charge sales showed a sample standard
deviation of $47. A 90% confidence interval estimate of the
population standard deviation is (Round your answers to 2 decimal
places.)

Compute the (sample) variance and standard deviation of the data
sample. (Round your answers to two decimal places.)
−1, 7, 7, 5, 12
variance
22
standard deviation
?

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