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21. Data that provide labels or names for categories of like items are known as a. qualitative data b. quantitative data c. label data d. category data 22. A tabular method that can be used to summarize the data on two variables simultaneously is called a. simultaneous equations b. crosstabulation c. a histogram d. an ogive 23. A graphical presentation of the relationship between two variables is a. an ogive b. a histogram c. either an ogive or a histogram, depending on the type of data d. a scatter diagram 24. A histogram is said to be skewed to the left if it has a a. longer tail to the right b. shorter tail to the right c. shorter tail to the left d. longer tail to the left 25. When a histogram has a longer tail to the right, it is said to be a. symmetrical b. skewed to the left c. skewed to the right d. none of these alternatives is correct 26. In a scatter diagram, a line that provides an approximation of the relationship between the variables is known as a. approximation line b. trend line c. line of zero intercept d. line of zero slope Exhibit 2-1 The numbers of hours worked (per week) by 400 statistics students are shown below. Number of hours Frequency 0 - 9 20 10 - 19 80 20 - 29 200 30 - 39 100 27. Refer to Exhibit 2-1. The class width for this distribution a. is 9 b. is 10 c. is 39, which is: the largest value minus the smallest value or 39 - 0 = 39 d. varies from class to class 28. Refer to Exhibit 2-1. The number of students working 19 hours or less a. is 80 b. is 100 c. is 180 d. is 300 29. Refer to Exhibit 2-1. The relative frequency of students working 9 hours or less a. is 20 b. is 100 c. is 0.95 d. 0.05 30. Refer to Exhibit 2-1. The percentage of students working 19 hours or less is a. 20% b. 25% c. 75% d. 80% 31. Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20 - 29 a. is 300 b. is 0.25 c. is 0.75 d. is 0.5 32. Refer to Exhibit 2-1. The cumulative percent frequency for the class of 30 - 39 is a. 100% b. 75% c. 50% d. 25% 33. Refer to Exhibit 2-1. The cumulative frequency for the class of 20 - 29 a. is 200 b. is 300 c. is 0.75 d. is 0.5 34. Refer to Exhibit 2-1. If a cumulative frequency distribution is developed for the above data, the last class will have a cumulative frequency of a. 100 b. 1 c. 30 - 39 d. 400 35. Refer to Exhibit 2-1. The percentage of students who work at least 10 hours per week is a. 50% b. 5% c. 95% d. 100% 36. Refer to Exhibit 2-1. The midpoint of the last class is a. 50 b. 34 c. 35 d. 34.5
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