PracticeTest1Answers

PracticeTest1Answers - Answers to Practice Set (Test1) 1....

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1. (a) descriptive (b) inferential (c) descriptive (d) inferential. 2. (a) (3) (b) (2) 3. 1). Descriptive statistics: use the tabular, graphical, and numerical methods to summarize data. 2). Inferential statistics: the process of using data obtained from a small group of elements (the sample ) to make estimates and test hypotheses about the characteristics of a larger group of elements (the population ). 4. (a) 55.0%, 31.5%, 7.0%, 4.5%, 1.5%, .5% (b) Histogram 0 20 40 60 80 100 120 0--4 5--9 10--14 15--19 20--24 25--29 More # of sick leave Frequency (c) 0 to under 4 (explanation: the median or middle value of all the sick leave amounts would be the average of the 100th and 101st in the ordered list; these 100th and 101st amounts are somewhere in the first interval--which contains the first 110 amounts in the list--thus their average is somewhere in the first interval) 5. a. frequency table class width=(max-min)/# of classes=(215-90)/5=25 a. b. c. class
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PracticeTest1Answers - Answers to Practice Set (Test1) 1....

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