PSY340: Statistics for the Social Sciences

Part I:

1) An instructor asked fie students how many hours they had studied for an exam. Here are the number of hours studied and the students' grades. Compute the Pearson's r correlation coefficient. What does this number mean?

Hours Studied	Test Grade
0	52
10	95
6	83
8	71
6	64

2) In a study of people first getting acquainted with each otehr, researchers reasoned te amount of self-disclousre of one's partner and one's liking for one's partner. The results are presented below (both raw scores and z-scores).

Partner's Self-Disclosure		Liking for Partner
Actual Score	Z-score	Actual Score	Z-score
18	0.37	8	1.10
17	0.17	9	1.47
20	0.80	6	0.37
8	-1.72	1	-1.47
13	-0.67	7	0.74
24	1.63	1	-1.47
11	-1.09	3	-0.74
12	-0.88	5	0.00
18	0.38	7	0.74
21	1.00	3	-0.74

a) Make a scatterplot of the raw scores
b) Make a scatterplot of the z-scores. How does this plot compare with the plot that you made in (a)?
c) Compute the Pearson's r correlation coefficent. Does it fit your scatterplot?

1) Make a scatterplot of math and verbal SAT scores. Describe the relationship.
2) Compute the Pearson's correlation coefficient between math and verbal SAT scores.
3) Make a scatterplot of college GPA and gender. How informative is this scatterplot?
4) Have SPSS compute a correlation matrix for the correlations between high school math, science, and English gpa. Which two variables are most strongly related? Which have the weakest relationship?