OPRE 3360 EXAM 3 COMPLETE
QUESTIONS WITH 100% VERIFIED
ANSWERS
\.An estimate of a population parameter that provides an interval believed to
contain the value of the parameter is known as the
a. confidence level
b. interval estimate
c. parameter value
d. population estimate - ANSWERS✔-b. interval estimate
\.As the sample size increases, the margin of error
a. increases
b. decreases
c. stays the same
d. None of the other answers is correct. - ANSWERS✔-b. decreases
\.The Z value for a 97.8% confidence interval estimation is
a. 2.02
b. 1.96
c. 2.00
,d. 2.29 - ANSWERS✔-d. 2.29
\.It is known that the variance of a population equals 1,936. A random sample of
121 has been taken from the population. The margin of error in a 95% confidence
interval is:
a. 7.84
b. 31.36
c. 344.96
d. 1,936 - ANSWERS✔-a. 7.84
\.A random sample of 144 observations has a mean of 20, a median of 21, and a
mode of 22. The population standard deviation is known to equal 4.8. The 95.44%
confidence interval for the population mean is
a. 15.2 to 24.8
b. 19.2 to 20.8
c. 19.216 to 20.784
d. 21.2 to 22.8 - ANSWERS✔-b. 19.2 to 20.8
\.To estimate a population mean, the sample size needed to provide a margin of
error of 2 or less with a 95% confidence interval when the population standard
deviation equals 11 is
a. 10
b. 11
c. 116
d. 117 - ANSWERS✔-d. 117
, \.Scenario 1: To estimate the average time spent on the computer terminals per
student at a local university, data were collected from a sample of 81 business
students over a one-week period. Assume the population standard deviation is 1.2
hours.
The standard error of the mean is
a. 7.5
b. 0.014
c. 0.160
d. 0.133 - ANSWERS✔-d. 0.133
\.Scenario 1: To estimate the average time spent on the computer terminals per
student at a local university, data were collected from a sample of 81 business
students over a one-week period. Assume the population standard deviation is 1.2
hours.
With a 0.95 probability, the margin of error is approximately
a. 0.26
b. 1.96
c. 0.21
d. 1.64 - ANSWERS✔-a. 0.26
\.Scenario 1: To estimate the average time spent on the computer terminals per
student at a local university, data were collected from a sample of 81 business
QUESTIONS WITH 100% VERIFIED
ANSWERS
\.An estimate of a population parameter that provides an interval believed to
contain the value of the parameter is known as the
a. confidence level
b. interval estimate
c. parameter value
d. population estimate - ANSWERS✔-b. interval estimate
\.As the sample size increases, the margin of error
a. increases
b. decreases
c. stays the same
d. None of the other answers is correct. - ANSWERS✔-b. decreases
\.The Z value for a 97.8% confidence interval estimation is
a. 2.02
b. 1.96
c. 2.00
,d. 2.29 - ANSWERS✔-d. 2.29
\.It is known that the variance of a population equals 1,936. A random sample of
121 has been taken from the population. The margin of error in a 95% confidence
interval is:
a. 7.84
b. 31.36
c. 344.96
d. 1,936 - ANSWERS✔-a. 7.84
\.A random sample of 144 observations has a mean of 20, a median of 21, and a
mode of 22. The population standard deviation is known to equal 4.8. The 95.44%
confidence interval for the population mean is
a. 15.2 to 24.8
b. 19.2 to 20.8
c. 19.216 to 20.784
d. 21.2 to 22.8 - ANSWERS✔-b. 19.2 to 20.8
\.To estimate a population mean, the sample size needed to provide a margin of
error of 2 or less with a 95% confidence interval when the population standard
deviation equals 11 is
a. 10
b. 11
c. 116
d. 117 - ANSWERS✔-d. 117
, \.Scenario 1: To estimate the average time spent on the computer terminals per
student at a local university, data were collected from a sample of 81 business
students over a one-week period. Assume the population standard deviation is 1.2
hours.
The standard error of the mean is
a. 7.5
b. 0.014
c. 0.160
d. 0.133 - ANSWERS✔-d. 0.133
\.Scenario 1: To estimate the average time spent on the computer terminals per
student at a local university, data were collected from a sample of 81 business
students over a one-week period. Assume the population standard deviation is 1.2
hours.
With a 0.95 probability, the margin of error is approximately
a. 0.26
b. 1.96
c. 0.21
d. 1.64 - ANSWERS✔-a. 0.26
\.Scenario 1: To estimate the average time spent on the computer terminals per
student at a local university, data were collected from a sample of 81 business
