Data Set 1-5: . Alex believed that family size affects a person's anxiety level, so he asked 66 undergraduate participants to list each blood relative they had a clear memory of. (The mean was 38.) Using these data, he classified students as having few, average, or many relatives. Participants also filled out the Social Avoidance and Distress Scale, which yields scores that range from 0 to 20.
-In Alex's experiment (Data Set 1-5), the number of levels of the independent variable is
A) 2
B) 3
C) 38
D) some number between 0 and 20.

Question

Quizplus · Accepted Answer

The independent variable is the classification of students based on family size into few, average, or many relatives, which constitutes three levels.