January 16, 2008

January 16, 2008 - and their frequency of occurrence Range...

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January 16 Outline I. Frequency distribution of grouped scores A. Used when the range is large B. Steps 1. Find range 2. Determine interval width (i) 3. List intervals 4. Tally frequencies C. Loss of information II. Computing percentiles A. Preliminary step--determine cumulative frequencies and cumulative percentages B. Find the interval associated with the percentile C. Compute percentile: Percentile point = X L + (i/f i ) (cumf P – cumf L ) III. Computing percentile ranks A. Similar steps, different equation: P. rank = cumf L + ( f i /i) (X - X L ) x 100% N
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Frequency distribution: presents the score values
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Unformatted text preview: and their frequency of occurrence Range: the difference between the highest and lowest score in the distribution Percentile: the value on the measurement scale below which a specified percentage of the scores in the distribution fall Cumulative frequency: the number of scores that fall below the upper real limit of an interval Cumulative percentage: the percentage of scores that fall below the upper real limit of an interval Percentile rank: the percentage of scores with values lower than the score in question...
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January 16, 2008 - and their frequency of occurrence Range...

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