Question

Students wish to test the effectiveness of a study guide they are using to improve scores on a standardized test. The students each take two practice tests, one before using the study guide, and one after. Their scores are below. With alpha = 0.1, test the claim that the scores actually stayed the same.

Before	After
87	92
79	83
75	77
72	78

Answer 1

Using paired t-test,

	Before	After
	87	92	5	0.5625
	79	83	4	0.0625
	75	77	2	5.0625
	72	78	6	3.0625
Total			17	8.75

So, the test score before and after using the study guide are stayed up same.