GRE (Graduate Record Examinations) Psychology Measurement and Methodology-Statistical Procedures Study Material (Page 8 of 24)

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Distributions: Frequency Distribution and Frequency Histogram

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Frequency Distribution

Systematic arrangement of all variables showing number of occurrences in each category is known as frequency distribution. Table below shows how much time students spent to study for exam. Total number counted in each category equals to number listed in frequency column. See table

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Distribution: Frequency Polygon

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Frequency Polygon

Graphs where frequency of occurrence of the measured variable is shown by connecting points rather than bars is known as frequency polygon. Connecting midpoints of each of the bars in histogram results in frequency polygon. Frequency polygon for the above example is given below.

Frequency polygon

Frequency Polygon

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Ogive or Cumulative Curve: These determine the frequency or proportion of cases above or below any given va

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