COM 901 Descriptive Statistics Grouping in Frequencies Interval widths should always be equal. Highest value of distribution should be at the top as per APA format. Graphics Interval Data is graphed with a histogram.
Histograms show continuity of data i.e. continuous interval.
Enough intervals will produce a smooth graphic. Measures of Variability Range Range is Y max Y min . This relationship is also determined by boxplots. Deviation Difference of each score from the mean. Deviation always sums to zero.