Question

a health psychologist tests a new intervention to determine if it can change healthy behaviors among siblings to conduct the this test issuing a matched pairs design the researcher gives one sibling an intervention and the other sibling is given a control task without the intervention the number of healthy behaviors observed in the sibling during a 5 minute observation were then recorded

Yes: 10, 7, 11, 8, 7, 7, 10, 7, 6, 4, 11, 8, 11, 8

No: 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 4
Analyze the data with the appropriate t test on SPSS and write your results in APA format. let a= 0.05

Answer 1

Ans:

Matched pairs t test:

Subject	Yes	No	d
1	10	1	9
2	7	1	6
3	11	1	10
4	8	1	7
5	7	1	6
6	7	1	6
7	10	1	9
8	7	2	5
9	6	2	4
10	4	2	2
11	11	2	9
12	8	3	5
13	11	3	8
14	8	4	4
		d-bar	6.429
		sd	2.344

Test statistic:

t=(6.429-0)/(2.344/SQRT(14))

t=10.262

df=14-1=13

p-value=tdist(10.262,13,2)=0.0000

As,p-value<0.05,reject the null hypothesis and we can conclude that there is significant difference in the number of healthy behaviors.

t(13)=10.262,p<0.05,significant