AP Statistics / Unit 1: Exploring One-Variable Data and Collecting Data
1.3 Tabular Representation and Summary Statistics for One Categorical Variable
Notes
A frequency table counts each category. A relative frequency table gives proportions or percents (count ÷ total).
Practice
12 of 40 students prefer dogs. The relative frequency:
$\displaystyle \frac{12}{40}$.
Relative frequencies in a table should sum to:
They're parts of the whole.
Which summary fits a categorical variable?
Numbers like the mean need quantitative data.
Ready for more? Take the Unit 1 test.