QMB 3200 Final Exam with 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? - ** VERIFIED ANSWERS
**✔✔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 - ** VERIFIED ANSWERS **✔✔b. mean
The pth percentile is a value such that at least p percent of the observations are: - ** VERIFIED
ANSWERS **✔✔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 - ** VERIFIED ANSWERS **✔✔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. - ** VERIFIED ANSWERS **✔✔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? - ** VERIFIED ANSWERS **✔✔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: - ** VERIFIED ANSWERS **✔✔^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: - ** VERIFIED ANSWERS **✔✔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: -
** VERIFIED ANSWERS **✔✔sample statistic.
The measure of location that is most likely to be influenced by extreme values in a data set is the: - **
VERIFIED ANSWERS **✔✔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? - ** VERIFIED
ANSWERS **✔✔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? - ** VERIFIED ANSWERS **✔✔median
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? - ** VERIFIED ANSWERS
**✔✔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 - ** VERIFIED ANSWERS **✔✔b. mean
The pth percentile is a value such that at least p percent of the observations are: - ** VERIFIED
ANSWERS **✔✔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 - ** VERIFIED ANSWERS **✔✔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. - ** VERIFIED ANSWERS **✔✔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? - ** VERIFIED ANSWERS **✔✔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: - ** VERIFIED ANSWERS **✔✔^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: - ** VERIFIED ANSWERS **✔✔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: -
** VERIFIED ANSWERS **✔✔sample statistic.
The measure of location that is most likely to be influenced by extreme values in a data set is the: - **
VERIFIED ANSWERS **✔✔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? - ** VERIFIED
ANSWERS **✔✔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? - ** VERIFIED ANSWERS **✔✔median
