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QMB 3200 Final Exam Questions
and Answers A+ Graded (2025)
Suppose we have the following data: 12, 17, 13, 25, 16, 21, 30, 14, 16, and 18. To
find the 10% trimmed mean, what numbers should be deleted from the
calculation? - CORRECT ANSWER-12 and 30
Which of the following is not resistant to the outliers in a data set?
a. Median
b. Mean
c. Variance
d. Interquartile range - CORRECT ANSWER-b. mean
The pth percentile is a value such that at least p percent of the observations are: -
CORRECT ANSWER-less than or equal to this value.
Which of the following provides a measure of central location for the data?
a. Mean
b. Variance
c. Mode
d. Standard deviation - CORRECT ANSWER-a. mean
When testing water for chemical impurities, results are often reported as BDL,
that is, below detection limit. The following data set gives the measurements of
the amount of lead in a series of water samples taken from inner-city households
(ppm):
5, 7, 12, BDL, 10, 8, BDL, 20, 6
Which of the following is correct?
a. The mean lead level in the water is about 10 ppm.
b. The median lead level in the water is 8 ppm.
c. The mean lead level in the water is about 8 ppm.
d. The median lead level in the water is 7 ppm. - CORRECT ANSWER-d. The
median lead level in the water is 7 ppm.
A student made scores of 85, 56, and 91 on her first three statistics tests. What
score does she need to make on her next test to have an 80 test average? -
CORRECT ANSWER-88
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Growth factors for the population of Dallas in the past five years have been 1, 2,
3, 4, and 5, respectively. The geometric mean is: - CORRECT ANSWER-^5square
root 120
A sample of 99 distances has a mean of 24 feet and a median of 21.5 feet.
Unfortunately, it has just been discovered that an observation that was
erroneously recorded as "30" actually had a value of "35." If we make this
correction to the data, then: - CORRECT ANSWER-the median remains the same,
but the mean is increased.
A numerical value used as a summary measure for a sample, such as sample
mean, is known as a: - CORRECT ANSWER-sample statistic.
The measure of location that is most likely to be influenced by extreme values in
a data set is the: - CORRECT ANSWER-mean
A student was performing an experiment that compared a new high protein food
to the old food for pigs. He found the mean weight gain for subjects consuming
the new food to be 12.8 pounds with a standard deviation of 3.5 pounds. Later, he
realized that the scale was out of calibration by 1.5 pounds (meaning that the
scale weighed items 1.5 pounds more). What should be the summary measures,
mean and standard deviation, for the subjects consuming the new food? -
CORRECT ANSWER-The mean should be 11.3 and the standard deviation should
remain unchanged.
When a set of data has suspect outliers, which of the following is the referred
measure of central tendency? - CORRECT ANSWER-median
In a sample of 500 students whose mean height is 67.8 inches, 150 were women.
If the mean height of the women was 63.0 inches, what is the mean height of the
men in the sample? - CORRECT ANSWER-69.9
The coefficient of variation formula - CORRECT ANSWER-the standard deviation
divided by the mean and multiplied by 100.
The summary statistics for the hourly wages of a sample of 130 system analysts
are given below:
Mean = 60
Range = 20
Mode = 73
Variance = 324
Median = 74
The coefficient of variation is equal to: - CORRECT ANSWER-(square root 324/ 60
x100)= 30%
If the variance of a data set is correctly computed with the formula using in the
denominator, which of the following is true?
QMB 3200 Final Exam Questions
and Answers A+ Graded (2025)
Suppose we have the following data: 12, 17, 13, 25, 16, 21, 30, 14, 16, and 18. To
find the 10% trimmed mean, what numbers should be deleted from the
calculation? - CORRECT ANSWER-12 and 30
Which of the following is not resistant to the outliers in a data set?
a. Median
b. Mean
c. Variance
d. Interquartile range - CORRECT ANSWER-b. mean
The pth percentile is a value such that at least p percent of the observations are: -
CORRECT ANSWER-less than or equal to this value.
Which of the following provides a measure of central location for the data?
a. Mean
b. Variance
c. Mode
d. Standard deviation - CORRECT ANSWER-a. mean
When testing water for chemical impurities, results are often reported as BDL,
that is, below detection limit. The following data set gives the measurements of
the amount of lead in a series of water samples taken from inner-city households
(ppm):
5, 7, 12, BDL, 10, 8, BDL, 20, 6
Which of the following is correct?
a. The mean lead level in the water is about 10 ppm.
b. The median lead level in the water is 8 ppm.
c. The mean lead level in the water is about 8 ppm.
d. The median lead level in the water is 7 ppm. - CORRECT ANSWER-d. The
median lead level in the water is 7 ppm.
A student made scores of 85, 56, and 91 on her first three statistics tests. What
score does she need to make on her next test to have an 80 test average? -
CORRECT ANSWER-88
, mailto:://www.stuvia.com/user/BRAINSCAPE1
Growth factors for the population of Dallas in the past five years have been 1, 2,
3, 4, and 5, respectively. The geometric mean is: - CORRECT ANSWER-^5square
root 120
A sample of 99 distances has a mean of 24 feet and a median of 21.5 feet.
Unfortunately, it has just been discovered that an observation that was
erroneously recorded as "30" actually had a value of "35." If we make this
correction to the data, then: - CORRECT ANSWER-the median remains the same,
but the mean is increased.
A numerical value used as a summary measure for a sample, such as sample
mean, is known as a: - CORRECT ANSWER-sample statistic.
The measure of location that is most likely to be influenced by extreme values in
a data set is the: - CORRECT ANSWER-mean
A student was performing an experiment that compared a new high protein food
to the old food for pigs. He found the mean weight gain for subjects consuming
the new food to be 12.8 pounds with a standard deviation of 3.5 pounds. Later, he
realized that the scale was out of calibration by 1.5 pounds (meaning that the
scale weighed items 1.5 pounds more). What should be the summary measures,
mean and standard deviation, for the subjects consuming the new food? -
CORRECT ANSWER-The mean should be 11.3 and the standard deviation should
remain unchanged.
When a set of data has suspect outliers, which of the following is the referred
measure of central tendency? - CORRECT ANSWER-median
In a sample of 500 students whose mean height is 67.8 inches, 150 were women.
If the mean height of the women was 63.0 inches, what is the mean height of the
men in the sample? - CORRECT ANSWER-69.9
The coefficient of variation formula - CORRECT ANSWER-the standard deviation
divided by the mean and multiplied by 100.
The summary statistics for the hourly wages of a sample of 130 system analysts
are given below:
Mean = 60
Range = 20
Mode = 73
Variance = 324
Median = 74
The coefficient of variation is equal to: - CORRECT ANSWER-(square root 324/ 60
x100)= 30%
If the variance of a data set is correctly computed with the formula using in the
denominator, which of the following is true?
