Question

A sample of 200 observations is taken. The mean is 31.7 and the standard deviation is 1.8. Form a 90 percent confidence interval for the population mean.

[31.54 31.86] |
||

[28.74 34.66] |
||

[28.53 34.87] |
||

[31.49 31.91] |

Answer #1

A statistics practitioner took a random sample of 56
observations from a population whose standard deviation is 32 and
computed the sample mean to be 102.
Note: For each confidence interval, enter your answer in the
form (LCL, UCL). You must include the parentheses and the comma
between the confidence limits.
A. Estimate the population mean with 95% confidence.
Confidence Interval =
B. Estimate the population mean with 90% confidence.
Confidence Interval = C.
Estimate the population mean with 99%...

Exercise 8-2 A sample of 43 observations is taken from a normal
population with a standard deviation of 24. The sample mean is 43.
Determine the 80% confidence interval for the population mean.
(Round the final answers to 3 decimal places.) Confidence interval
for the population mean is and .
statistics

A sample of 23 observations is selected from a normal population
where the sample standard deviation is 4.95. The sample mean is
16.90.
a. Determine the standard error of the mean.
(Round the final answer to 2 decimal places.)
The standard error of the mean is _______ .
b. Determine the 90% confidence interval for
the population mean. (Round the t-value to 3
decimal places. Round the final answers to 3 decimal
places.)
The 90% confidence interval for the population...

A random sample of 64 observations produced a mean value of 73
and standard deviation of 6.5. The 90% confidence interval for the
population mean μ is between?
a) 69.663 and 76.337
b) 71.408 and 74.593
c) 71.663 and 74.337
d) 71.163 and 74.837
e) 72.163 and 73.837

A statistics practitioner took a random sample of 56
observations from a population whose standard deviation is 29 and
computed the sample mean to be 97. Note: For each confidence
interval, enter your answer in the form (LCL, UCL). You must
include the parentheses and the comma between the confidence
limits.
A. Estimate the population mean with 95% confidence. Confidence
Interval =
B. Estimate the population mean with 95% confidence, changing
the population standard deviation to 58; Confidence Interval =...

A statistics practitioner took a random sample of 57
observations from a population whose standard deviation is 29 and
computed the sample mean to be 97.
Note: For each confidence interval, enter your
answer in the form (LCL, UCL). You must include the parentheses and
the comma between the confidence limits.
A. Estimate the population mean with 95% confidence.
Confidence Interval =
B. Estimate the population mean with 95% confidence, changing
the population standard deviation to 48;
Confidence Interval =...

A statistics practitioner took a random sample of 40
observations from a population whose standard deviation is 15 and
compute the sample mean to be 50. The 90% confidence interval for
the mean will be between __________ and __________.

A random sample of 24 observations is used to estimate the
population mean. The sample mean and the sample standard deviation
are calculated as 104.6 and 28.8,
respectively. Assume that the population is normally
distributed. Construct the 90% confidence interval for the
population mean. Then, construct the 95% confidence
interval for the population mean. Finally, use your answers to
discuss the impact of the confidence level on the width of the
interval.

A sample of 235 observations is selected from a normal
population with a population standard deviation of 25. The sample
mean is 20.
Determine the standard error of the mean. (Round your
answer to 3 decimal places.)
Determine the 90% confidence interval for the population mean.
(Use z Distribution Table.) (Round your answers to
3 decimal places.)

A random sample of 20 observations is used to estimate the
population mean. The sample mean and the sample standard deviation
are calculated as 152 and 74, respectively. Assume that the
population is normally distributed.
What is the margin of error for a 95% confidence interval for
the population mean?
Construct the 95% confidence interval for the population
mean.
Construct the 90% confidence interval for the population
mean.
Construct the 78% confidence interval for the population mean.
Hint: Use Excel...

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