2300 Chapter Notes - Chapter 1-4: Level Of Measurement, Ibm 7070, Frequency Distribution

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Interval scale: ordered categories that are intervals of exactly the same size (zero is arbitrary i. e. iq, golf scores: ratio scale: interval scale with an absolute zero point (i. e. time to complete a task, # of correct answers) Frequency distributions: organized table of the number of individuals located in each category on the scale of measurement, can be a table or a graph. Grouped frequency distributions: should have no more than 10 intervals, width of each interval should be simple (2,5,10, the bottom score in each interval should be a multiple of the width, all intervals should be the same width. Central tendency: central tendency: statistical measure attempting to determine the single value that is most representative of the entire set, mean: sum of scores divided by the number of scores. Use when: symmetrical/normal distributions: median: the midpoint on a list of scores ordered from largest to smallest. Point below which 50% of the scores are located.

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