1. Scores for the 20 participants on the Hitchcock Fear Scale (ranges 1-100) are as follows:

3	20	33	54	80
11	20	38	55	85
14	25	40	60	90
15	29	45	60	95

To calculate the class interval, use the potential range of the Hitchcock Fear Scale (1-100), not the participants scores.

1. Class interval size (i):

1. Table

Class Interval	Frequency	Cumulative Frequency	Relative Frequency	Cumulative Relative Frequency	Cumulative Percent