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Descriptive Statistics:

Descriptive Statistics:. Describing your results. Ways of describing your results. Comparing group percentages Correlations of 2 or more variables Comparing group means Experimental or Quasi-experimental research. “What’s your favorite movie genre?”.

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Descriptive Statistics:

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  1. Descriptive Statistics: Describing your results

  2. Ways of describing your results • Comparing group percentages • Correlations of 2 or more variables • Comparing group means • Experimental or Quasi-experimental research

  3. “What’s your favorite movie genre?”

  4. Figure 1. Student and faculty response to the poll 'Should Avenue High School adopt student uniforms?'

  5. Correlation Coefficient • Numerical index that reflects the relationship between 2 variables • Ranges from –1 to +1 • Pearson product-moment correlation or Pearson’s r

  6. Understanding a correlation:Eyeballing your data

  7. Scatterplot • Illustrates the relationship between variables • X on the horizontal axis • Y on the vertical axis • Positive correlation • Data from lower left to upper right • Negative correlation • Data from upper right to lower left

  8. Scatterplot for + correlation

  9. Scatterplot

  10. Scatterplot for - correlation

  11. Scatterplot for no correlation

  12. Descriptive Statistics • Measures of Central Tendency • Mean: M • The average of the scores. • Add up all the scores and divide by number of scores. • Median: Mdn • The middle score. 50% of scores fall above, 50% fall below. • Put the numbers in order from lowest to highest, and then find middle score. If the number of scores is even, take the average of the two middle scores. • Mode • The most frequent score.

  13. Descriptive Statistics • Measures of Variability • Variance: s2 • Standard deviation: s or SD • N = number of participants

  14. Why Standard Deviation Matters

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