答案和详解如下： 1、In a frequency distribution histogram, the frequency of an interval is given by the: A) width of the corresponding bar. B) height multiplied by the width of the corresponding bar. C) sum of the width of all bars. D) height of the corresponding bar. The correct answer was D) In a histogram, intervals are placed on the horizontal axis, and frequencies are placed on the vertical axis. The frequency of a particular interval is given by the value on the vertical axis, or the height of the corresponding bar. 2、Which of the following statements about histograms and frequency polygons is FALSE? A) A frequency polygon is constructed by plotting the midpoint of each interval on the horizontal axis. B) A histogram and a frequency polygon both plot the absolute frequency on the vertical axis. C) Histograms and frequency polygons are graphical tools used for portraying frequency distributions. D) A histogram connects points with a straight line. The correct answer was D) In constructing a frequency polygon, the midpoint of each interval is plotted on the horizontal axis and the frequency of each interval is plotted on the vertical axis. Points are then connected with straight lines. A histogram is a bar chart of data that has been grouped into a frequency distribution – because it is a bar chart, there are no individual points to connect. 3、Which of the following indicates the frequency of an interval in a frequency distribution histogram? A) Height of the corresponding bar. B) Horizontal logarithmic scale. C) Width of the corresponding bar. D) Height multiplied by the width of the corresponding bar. The correct answer was A) In a histogram, intervals are placed on horizontal axis, and frequencies are placed on the vertical axis. The frequency of the particular interval is given by the value on the vertical axis, or the height of the corresponding bar. | 
发表于 2008-4-8 17:38
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