2. Statistics in Psychology

3. Descriptive Statistics Summarize quantitative information about some group. Frequency Distribution-shows how often a particular observation occurs

4. Descriptive Statistics Examples Histograms-similar to bar graphs shows frequency distribution by rectangles

5. Line graph Frequency Polygon- or line graph

6. Mean, Mode and Median Mean-average of all scores Mode-Appears most frequently Median-central score

7. The Bell Curve Z scores-distance of a score from the mean in units of standard deviation Normal Curve-theoretical bell shaped curve

8. Skewed Data Unless a distribution is symmetrical, it is skewed. Positive skew-a distribution with an extreme score High Negative skew- a distribution with a low score

9. Measures of Variability Depict the diversity of the distribution Range-distance between the highest and lowest score Variance/Standard Deviation-average distance of any score from the mean.