1. Frequency distributions and their graphs Frequency distribution tables give the number if instances of each value in a distribution. Frequency distribution graphs give a graphical depiction of the data in a frequency table. –Bar graphs –Histograms –Frequency polygons

2. Frequency Table for Parent’s Level of Education

3. Bar Graph of Parents’ Level of Education

4. Frequency Table of Achievement

5. Histogram of Achievement Scores

6. Bar graph of Achievement Scores

7. Shape of Distributions: Skew The skew of a (frequency) distribution tells us something about the shape of the distribution. Normal (bell-shaped) distributions are not skewed (have zero skew); symmetrical. Positive skew: tail in the direction of high scores. Negative skew: tail in the direction of low scores.