PSYCH 2220 Lecture Notes - Lecture 2: Frequency Distribution, Ibm 7070, Unimodality
3 Feb 2018
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Raw scores - data points that have not yet been transformed or analyzed. Frequency distribution - describes the pattern of a set of #s by displaying a count or proportion for each possible value of a variable. Organization of # of times a value has occurred. Can be displayed as a group frequency table, a histogram, or a frequency polygon. 3) list full range of values (include 0 frequency values) 4) count and list # of scores at each value. Use when you have decimals or a large range of data by using intervals. Round #s down, subtract, then add 1. 3) determine # of intervals and best interval size. 4) figure out # that will be the bottom of lowest interval. Bottom of interval should be multiple of interval size. 5) finish by listing intervals and counting # of scores in each. Ex) exam scores 85, 87, 84, etc.
