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PSYC 210 - Frequency Distributions

PSYC 210 - Frequency Distributions - Psychology 210 Dr Viji...

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Psychology 210, Dr. Viji Sathy Frequency Distributions What is a Frequency Distribution? Frequency Distributions: An organized tabulation of the number of individuals (or scores) located in each category on the scale of measurement 1. A frequency distribution may be displayed in a table or a graph. 2. A frequency distribution may be ungrouped or grouped A. Ungrouped Frequency Distribution: List each individual score or category on the scale in order from lowest to highest or highest to lowest For each score or category, indicate the frequency, or the number of times it occurs in the data set B. Grouped frequency distribution Scores or values are grouped into intervals For each interval, indicate the frequency or number of scores Constructing Frequency Distributions 1. Example Ungrouped Imagine we asked a class of 20 first-year college students how many times they went out to party in the previous week. Here are the fictional data: 1 2 7 6 1 2 6 5 4 4 0 3 2 2 3 4 3 5 4 4 Here is an ungrouped frequency distribution table: X f 7 1 6 2 5 2 4 5 3 3 2 4 1 2 0 1 Steps for constructing an ungrouped frequency distribution 1. HI/LO Determine range (highest -lowest score), if it’s less than 10 an ungrouped table would be appropriate Make a column for these scores 2. TALLY Next go through all the scores and make a tally each score and put the appropriate total next to that score.

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