Introduction To Statistics

79 . An open-ended bin (e.g., "50 and over") might be seen in a frequency distribution when: A. some data values are not integers. B. data values are non- numerical. C. extremely large data values exist. D. some data are missing. 80 . The width of a class in a frequency distribution is known as the: A. midpoin t. B. class limit. C. bin frequency. D. class interval. 81 . A population is of size 5,500 observations. When the data are represented in a relative frequency distribution, the relative frequency of a given interval is 0.15. The frequency in this interval is equal to: A. 4,67 5. B. 800 . C. 675 . D. 825 . 82 . A population has 75 observations. One class interval has a frequency of 15 observations. The relative frequency in this category is: A. 0.2 0. B. 0.1 0. C. 0.15 . D. 0.75 . 83 . Below is a sorted stem-and-leaf diagram for the measured speeds (miles per hour) of 49 randomly chosen vehicles on highway I-80 in Nebraska. How many vehicles were traveling exactly the speed limit (70 mph)? A. 0 B. 1 C. 1 9 D. Impossible to tell 84 . Below is a sorted stem-and-leaf diagram for the measured speeds (miles per hour) of 49 randomly chosen vehicles on highway I-80 in Nebraska. What is the highest observed speed? A. 9 2 B. 9 0 C. 8 7 D. Impossible to tell 85 . Below is a sorted stem-and-leaf diagram for the measured speeds (miles per hour) of 49 randomly chosen vehicles on highway I-80 in Nebraska. What is the mode? A. 6 2 B. 7 9 C. 6 5 D. Impossible to tell 86 . Below is a sorted stem-and-leaf diagram for the measured speeds (miles per hour) of 49 randomly chosen vehicles on highway I-80 in Nebraska. What is the fourth slowest speed in the sorted data array? A. 6 1 B. 6 0 C. 5 5 D. Impossible to tell 87 . Below is a sorted stem-and-leaf diagram for the measured speeds (miles per hour) of 49 randomly chosen vehicles on highway I-80 in Nebraska. The modal class is: A. 60 but less than 70. B. 70 but less than 80. C. 80 but less than 90. D. impossible to determine. 88 . A statistician prepared a bar chart showing, in descending order, the frequency of six underlying causes of general aviation accidents (pilot error, mechanical problems, disorientation, miscommunication, controller error, other). What would we call this type of chart? A. Pivot table B. Pareto chart C. Log scale chart D. Frequency polygon Short Answer Questions 89 . Brieﬂy list strengths and weaknesses of this display. Cite speciﬁc principles of good graphs, as well as oﬀering your own general interpretation.

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