If you have a distribution of 20 scores, and you want 2 intervals, what should be the size of your class interval?
A)50
B)25
C)10
D)5

Question

Quizplus · Accepted Answer

To have 2 intervals, you need to divide the data into 3 groups (2 intervals + 1 outside interval). Dividing the data into 3 equal groups would give a class interval of 10. Therefore, the best choice is C) 10. A) 50 would give only 1 interval, B) 25 would give only 2 intervals but may not divide the data evenly and D) 5 would give 4 intervals which is more than required.

If You Have a Distribution of 20 Scores, and You