COURSE:
HOMEWORK:
EDRS701 – EDUCATIONAL STATISTICS
1
ALL CALCULATIONS SHOULD BE PERFORMED USING SPSS
You have reviewed the student log sheets for 20 students in College Algebra attending the
mathematics lab and noticed the following:
X
Time Spent in Lab by student
(minutes per week)
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
Y
Math Score on first Test
for student attending X minutes per week
52
42
40
55
62
64
70
70
72
74
79
84
76
85
80
92
89
92
98
95
1. Looking at the data (not calculating anything yet!), would you expect a positive or
negative correlation between X and Y? Why?
2. What is the mean score on the first test of all 20 students?
3. Produce a scatterplot of the data.
4. What is the Pearson correlation coefficient of the original X and Y data?
5. What type of correlation is there between time spent in lab and score on the first test?
6. Are you prepared to make any causality statements? Why or why not?
7. What statement are you willing to make about the number of minutes spent in the math
lab?
8. Provide the regression equation for the data.
9. What is the predicted score on the first math test if you spend 62 minutes per week in the
math lab?
10. What is the predicted score on the first math test if you spend 28 minutes per week in the
math lab?