QMB 3200 Final Exam 2024 Questions & Answers (Graded A+)

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? -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 -ANSWER b. mean The pth percentile is a value such that at least p percent of the observations are: -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 -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. -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? -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: -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