QMB 3200 Final Exam CH 7 and 8
Question & Answers 2025
Doubling the size of the sample will: - CORRECT ANSWERS
✔✔reduce the standard error of the mean
How many simple random samples of size 5 can be selected from a
population of size 8? - CORRECT ANSWERS ✔✔56
(8*7*6)/(1*2*3)
Cluster sampling is: - CORRECT ANSWERS ✔✔A probability sampling
method
The distribution of values taken by a statistic in all possible samples of
the same size from the same population is the sampling distribution of:
- CORRECT ANSWERS ✔✔the sample
A random sample of 150 people was taken from a very large
population. Ninety of the people in the sample were female. The
standard error of the proportion is: - CORRECT ANSWERS ✔✔.0400
sqrt(.6)(.4)/150)
Parameters are: - CORRECT ANSWERS ✔✔numerical characteristics
of a population.
,QMB 3200 Final Exam CH 7 and 8
Question & Answers 2025
A sample of 66 observations will be taken from an infinite population.
The population proportion equals .12. The probability that the sample
proportion will be less than .1768 is: - CORRECT ANSWERS ✔✔.92
sqrt(.12)(.88)/66) = 0.04
Z= Sample proportion-population proportion/ .04 = 1.42
find 1.42 in z table
The value of the _____ is used to estimate the value of the population
parameter. - CORRECT ANSWERS ✔✔sample statistic
A simple random sample of 100 observations was taken from a large
population. The sample mean and the standard deviation were
determined to be 80 and 12, respectively. The standard error of the
mean is: - CORRECT ANSWERS ✔✔1.20
σx̅= sigma/sqrt(n)
12/sqrt(100)
In a survey of public opinion concerning state aid to a particular city,
every 40th person registered as a voter was interviewed, beginning
with a person selected at random from among the first 40 listed. This is
an example of: - CORRECT ANSWERS ✔✔systematic sampling
, QMB 3200 Final Exam CH 7 and 8
Question & Answers 2025
In computing the standard error of the mean, the finite population
correction factor is used when: - CORRECT ANSWERS ✔✔n/N > 0.5
The central limit theorem states that: - CORRECT ANSWERS ✔✔if
the sample size n is large, then the sampling distribution of the sample
mean can be approximated by a normal distribution.
In a recent Gallup Poll, the decision was made to increase the size of its
random sample of voters from 1500 people to about 4000 people. The
purpose of this increase is to: - CORRECT ANSWERS ✔✔reduce the
standard error of the estimate.
A random sample of 121 bottles of cologne showed an average content
of 4 ounces. It is known that the standard deviation of the contents
(i.e., of the population) is .22 ounces. In this problem, the value .22
ounces is: - CORRECT ANSWERS ✔✔a parameter
Which of the following is not a symbol for a parameter? - CORRECT
ANSWERS ✔✔s, standard deviation of a SAMPLE
Random samples of size 100 are taken from an infinite population
whose population proportion is .2. The mean and standard deviation of
the sample proportion are: - CORRECT ANSWERS ✔✔.2 and .04
Question & Answers 2025
Doubling the size of the sample will: - CORRECT ANSWERS
✔✔reduce the standard error of the mean
How many simple random samples of size 5 can be selected from a
population of size 8? - CORRECT ANSWERS ✔✔56
(8*7*6)/(1*2*3)
Cluster sampling is: - CORRECT ANSWERS ✔✔A probability sampling
method
The distribution of values taken by a statistic in all possible samples of
the same size from the same population is the sampling distribution of:
- CORRECT ANSWERS ✔✔the sample
A random sample of 150 people was taken from a very large
population. Ninety of the people in the sample were female. The
standard error of the proportion is: - CORRECT ANSWERS ✔✔.0400
sqrt(.6)(.4)/150)
Parameters are: - CORRECT ANSWERS ✔✔numerical characteristics
of a population.
,QMB 3200 Final Exam CH 7 and 8
Question & Answers 2025
A sample of 66 observations will be taken from an infinite population.
The population proportion equals .12. The probability that the sample
proportion will be less than .1768 is: - CORRECT ANSWERS ✔✔.92
sqrt(.12)(.88)/66) = 0.04
Z= Sample proportion-population proportion/ .04 = 1.42
find 1.42 in z table
The value of the _____ is used to estimate the value of the population
parameter. - CORRECT ANSWERS ✔✔sample statistic
A simple random sample of 100 observations was taken from a large
population. The sample mean and the standard deviation were
determined to be 80 and 12, respectively. The standard error of the
mean is: - CORRECT ANSWERS ✔✔1.20
σx̅= sigma/sqrt(n)
12/sqrt(100)
In a survey of public opinion concerning state aid to a particular city,
every 40th person registered as a voter was interviewed, beginning
with a person selected at random from among the first 40 listed. This is
an example of: - CORRECT ANSWERS ✔✔systematic sampling
, QMB 3200 Final Exam CH 7 and 8
Question & Answers 2025
In computing the standard error of the mean, the finite population
correction factor is used when: - CORRECT ANSWERS ✔✔n/N > 0.5
The central limit theorem states that: - CORRECT ANSWERS ✔✔if
the sample size n is large, then the sampling distribution of the sample
mean can be approximated by a normal distribution.
In a recent Gallup Poll, the decision was made to increase the size of its
random sample of voters from 1500 people to about 4000 people. The
purpose of this increase is to: - CORRECT ANSWERS ✔✔reduce the
standard error of the estimate.
A random sample of 121 bottles of cologne showed an average content
of 4 ounces. It is known that the standard deviation of the contents
(i.e., of the population) is .22 ounces. In this problem, the value .22
ounces is: - CORRECT ANSWERS ✔✔a parameter
Which of the following is not a symbol for a parameter? - CORRECT
ANSWERS ✔✔s, standard deviation of a SAMPLE
Random samples of size 100 are taken from an infinite population
whose population proportion is .2. The mean and standard deviation of
the sample proportion are: - CORRECT ANSWERS ✔✔.2 and .04
