# Frequency distributions and their graphs Frequency distribution tables give the number if instances of each value in a distribution. Frequency distribution.

## Presentation on theme: "Frequency distributions and their graphs Frequency distribution tables give the number if instances of each value in a distribution. Frequency distribution."— Presentation transcript:

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

Frequency Table for Parent’s Level of Education

Bar Graph of Parents’ Level of Education

Frequency Table of Achievement

Histogram of Achievement Scores

Bar graph of Achievement Scores

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.

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