QMB 3200 – Final Exam Questions and Answers (2025–2026, Graded A+) | Complete Study Resource

QMB 3200 Final Exam Questions And
Answers 2024:2025 Already Graded A+

Suppose we have the following data: 12, 17, 13, 25, 16, 21, 30,
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14, 16, and 18. To find the 10% trimmed mean, what numbers sho
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uld be deleted from the calculation? - ANSWER-12 and 30
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Which of the following is not resistant to the outliers in a data set?
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a. Mediani




b. Mean i


c. Variance
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d. Interquartile range - ANSWER-b. mean
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The pth percentile is a value such that at least p percent of the obser
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vations are: - ANSWER-less than or equal to this value.
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Which of the following provides a measure of central location for th
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e data?
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a. Mean
b. Variance
c. Mode
d. Standard deviation - ANSWER-a. mean
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,When testing water for chemical impurities, results are often rep
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orted as BDL, that is, below detection limit. The following data set
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gives the measurements of the amount of lead in a series of water
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samples taken from inner-city households (ppm): i i i i i




5, 7, 12, BDL, 10, 8, BDL, 20, 6
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Which of the following is correct? i i i i i




a. The mean lead level in the water is about 10 ppm.
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b. The median lead level in the water is 8 ppm.
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c. The mean lead level in the water is about 8 ppm.
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d. The median lead level in the water is 7 ppm. - ANSWER-
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d. The median lead level in the water is 7 ppm.
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A student made scores of 85, 56, and 91 on her first three statistics t
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ests. What score does she need to make on her next test to have an
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80 test average? - ANSWER-88
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,Growth factors for the population of Dallas in the past five years h
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ave been 1, 2, 3, 4, and 5, respectively. The geometric mean is: -
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ANSWER-^5square root 120
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A sample of 99 distances has a mean of 24 feet and a median of
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21.5 feet. Unfortunately, it has just been discovered that an observ
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ation that was erroneously recorded as "30" actually had a value of
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"35." If we make this correction to the data, then: - ANSWER-
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the median remains the same, but the mean is increased.
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A numerical value used as a summary measure for a sample, such as
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sample mean, is known as a: - ANSWER-sample statistic.
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, The measure of location that is most likely to be influenced by extre
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me values in a data set is the: - ANSWER-mean
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A student was performing an experiment that compared a new hig
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h protein food to the old food for pigs. He found the mean weight ga
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in for subjects consuming the new food to be 12.8 pounds with a sta
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ndard deviation of 3.5 pounds. Later, he realized that the scale was
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out of calibration by 1.5 pounds (meaning that the scale weighed it
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ems 1.5 pounds more). What should be the summary measures, m
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ean and standard deviation, for the subjects consuming the new fo
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od? - i


ANSWER-
The mean should be 11.3 and the standard deviation should remai
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n unchanged.
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When a set of data has suspect outliers, which of the following is the
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referred measure of central tendency? - ANSWER-median
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In a sample of 500 students whose mean height is 67.8 inches, 150
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were women. If the mean height of the women was 63.0 inches,
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what is the mean height of the men in the sample? - ANSWER-69.9
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The coefficient of variation formula - ANSWER-
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the standard deviation divided by the mean and multiplied by 100.
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