To determine the width of the class interval, i, divide the range by the number of class intervals.
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In a cumulative percentage curve, percentage is shown on the abscissa.
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A U shaped distribution is an example of a symmetrical distribution.
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Bar graphs are generally used for nominal or ordinal data and histograms are generally used for interval or ratio data.
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The vertical axis, i.e., the Y axis of a graph, is called the abscissa.
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A relative frequency distribution indicates the total number of scores which occurred in each interval.
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A cumulative frequency distribution indicates the number of scores which fell below the upper real limit of each interval.
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When constructing the frequency distribution it is customary to show the real limits of the class intervals in the table.
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One reason for constructing frequency distributions is to be able to visualize the shape of the distribution.
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In a frequency distribution the more intervals the better, regardless of whether some intervals have zero frequency.
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