QMB 3200 Final Exam UPDATED
ACTUAL Questions and CORRECT
Answers
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
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
ACTUAL Questions and CORRECT
Answers
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
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
