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Frequency Distributions

Frequency Distributions. Organized Counting. Overview. Frequency table Values Frequencies, proportions & percentages Cumulative frequencies, proportions, & percentages Calculating the overall sum or ∑X. Graphing frequency distributions. Histograms Typically for continuous variables

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Frequency Distributions

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  1. Frequency Distributions Organized Counting

  2. Overview • Frequency table • Values • Frequencies, proportions & percentages • Cumulative frequencies, proportions, & percentages • Calculating the overall sum or ∑X

  3. Graphing frequency distributions • Histograms • Typically for continuous variables • Bars adjacent to one another • Bar graphs • Typically for categorical variables • Spaces between bars • Frequency polygons

  4. Shapes of Frequency Distributions • Positively skewed • Bulk of scores to the left • Negatively skewed • Bulk of scores to the right • Tails of the distribution

  5. In class exercises • Jolly Rancher experiment • Multiple ways to categorize (coding schemes) • Using a frequency table to summarize values of X, their frequencies, proportions, percentages, cumulative proportions & cumulative percentages. • Age distribution • Skewed distribution

  6. The Normal Distribution • Symmetrical distribution • Underlying assumption for many statistical techniques discussed later • More to come later in Chapter 6

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