Greg has just collected the following data to examine the effects of a new program on pro-social attitudes among a small, random sample of juvenile offenders. The first set of scores represents the participants' scores on the pro-social attitudes scale prior to the program. The second set of scores represents their scores after the program. Greg hypothesizes that the offenders' scores after the program are significantly different than their scores before the program. Use this information to answer this question and the remaining questions in this assignment.

Pairs	X1	X2
1	12	15
2	8	11
3	16	15
4	10	16
5	10	13
6	17	17
7	11	18
8	9	12
9	13	15

Which test should greg use to test the hypothesis?

a) One sample z test

b) Independent samples t test

c) One sample t test

d) Dependent/paired samples t test

What is gregs research hypothesis?

a) H₀:₁=₂

b) H₁: M <

c) H₁: M₁ < M₂

d) none of the above

Go through the calculations and determine the obtained value. What isd²?

a) 2.89

b) 26

c) 127

d) 126

e) none of the above

What is the final obtained value (t_obt)?

a) .454

b) 3.436

c) 3.228

d) none of the above

Assuming a significance level of .01, what is the critical value?

a) +/-2

b) -2.897

c) +/-2.306

d) +/-3.356

e) none of the above

Accept or reject the null hypothesis, and why?

What do these results tell greg about the new pro-social attitudes program?