1. Do students that work more hours each week have lower grades in college? Unethically, I chose 5000 students and assigned them to one of two groups: Group 1(Var 1 ) I forced to work 40 hours a week. Group 2 (Var 2 ): I forced them to work only 20 hours per week. Then I looked at their GPA for the semester.

Here are my results:

Group Statistics
	VAR00002	N	Mean	Std. Deviation	Std. Error Mean
VAR00001	1.00	20	3.1450	.39400	.08810
2.00	20	2.9800	.62878	.14060

Independent Samples Test Levene's Test for Equality of Variances t-test for Equality of Means 95% Confidence Interval of the Significance Mean Std. Error Difference F sig. di One-Sided p Two-Sided p Difference Difference Lower Upper VAR00001 Equal variances 2.425 128 994 38 163 326 16500 16592 -.17089 50089 assumed Equal variances not 994 31.927 .164 327 16500 16592 .17300 50300 assumed