3:10 PM Done Test-#1 (Ch. 1-6 with 40 Questions).docx 19. If the distribution of

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3:10 PM Done Test-#1 (Ch. 1-6 with 40 Questions).docx 19. If the distribution of weekly study times reported by college T-Mobile LTE 31%) students has a mean of 25 hours with a standard deviation of 10 hours, this implies that a. a small minority study either less than 5 hours or more than 45 hours. b. a majority study between 15 and 35 hours. c individuals deviate, on the average, approximately 10 hours from the mean of 25 hours, d. all of the above A key property of the interquartile range is its a. resistance to the distorting effect of extreme observations. b. sensitivity to all observations. c. sensitivity to extreme observations. d. use of information from only two observations. 20· 21. If the normal curve is used to describe the distribution of IQ scores for a currently enrolled students in U.S. colleges and universities, all students are identified with the a. smooth normal curve. b. total area under the normal curve. c. maximum height of the normal curve. d. horizontal axis. 22. Since the normal curve never actually touches the horizontal axis, a. most of the area is in its extremities. b. the total area is infinitely large. c. the normal tables are only approximate d. very extreme observations are possible 23. Any particular normal curve is transformed into a new normal curve whenever changes occur in a. its mean. b. its standard deviation. c. both its mean and its standard deviation. d. either its mean or its standard deviation. 24. For any z score, the corresponding proportions in columns B and C always sum to a. 1.0000 b. 0.5000

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Ans 19

d) All of the above

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