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Chapter 2

PSY2106 Chapter 2: Frequency Distributions definitions

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Brenda Baird

Frequency distribution: an organized tabulation of the number of individuals located in each category on the scale of measurement.Afrequency distribution table should have 10 intervals. Range: the difference between the lowest score and highest score (H-L+1). Grouped frequency distributions: present groups of scores rather than individual values. Class interval: the groups, or intervals, in grouped frequency distributions Apparent limits: form the upper and lower boundaries of a class interval Histogram: used when the data consists of numerical scores that has been measured on an interval or ratio scale. Abar is drawn above each score so that the height of the bar corresponds to the frequency. Each bar extends to the real limits of the score, so that adjacent bars touch. Polygon: used when the data consists of numerical scores that has been measured on an interval or ratio scale.Adot is placed above the midpoint of each score or class interval so that the height of the dot corresponds to the frequency; then lines are drawn to connect the dots. Bar graph: used with nominal or ordinal scales. They are similar to histograms except that gaps are left between adjacent bars. Relative frequency: since you usually cannot find the absolute frequency for each score in a population, you can obtain relative frequencies. For example, you may not know ex
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