Question

A researcher compares graduate students’ verbal GRE scores by their preparatory effort. One group of students did not complete a GRE preparatory class, one group completed a 3-week GRE preparatory class, and one group completed a 6-week preparatory class.

Is there a statistically significant difference in average verbal GRE score among graduate students who did not complete a GRE preparatory class, completed a 3-week GRE preparatory class, and completed a 6-week preparatory class?

Given:

	No preparatory Class	3-week preparatory Class	6-week preparatory Class
n	8	10	12
Average verbal GRE score	368.75	476.00	481.67
SSB = 71,602.50 SSW = 34,044.17

What is the dependent and independent variable? Use the variable name, not the value.

Answer 1

There are two variables, one is average verbal GRE score and other is preparatory effort

It is clear from the data that preparatory effort has three different level and their corresponding average verbal scores.

Therefore, dependent variable is average verbal GRE score and independent variable is preparatory effort because average verbal GRE scores are measured based on the preparatory effort.

So, Dependent variable = Average verbal GRE score

Independent variable = Preparatory effort