(Part 1) Week 6 Assignment 2: One-Sample T-Test Computations
Thirty anorexic girls were treated with cognitive behavioral therapy (CBT). They were weighed before and after the treatment. The weight gains, which are positive scores, and weight losses, which are negative scores, are given below. A gain of more than zero pounds would confirm whether the treatment worked. Did the group gain more than zero pounds?
Data:
|
1.7
|
0.7
|
-0.1
|
-0.7
|
-3.5
|
14.9
|
3.5
|
17.1
|
-7.6
|
1.6
|
|
11.7
|
6.1
|
1.1
|
-4.0
|
20.9
|
-9.1
|
2.1
|
-1.4
|
1.4
|
-0.3
|
|
-3.7
|
-0.8
|
2.4
|
12.6
|
1.9
|
3.9
|
0.1
|
15.4
|
-0.7
|
0
|
Report the appropriate null and research hypotheses and the critical value
(alpha = 0.05). In addition, provide your statistical conclusion, including calculation of test statistic, in the APA format and conceptual conclusion in one to two sentences.
(Part 2) Week 6 Assignment 3: Independent-Samples T-Test Computations
You obtain the data shown below for 30 girls with anorexia who were treated with psychodynamic therapy. These values can be interpreted as described in Week 6: Assignment 2. Using these data and those from Week 6: Assignment 2, compare the outcomes for CBT and psychodynamic therapy. Must compute any descriptive statistics you need (excel, spss, or by hand), but you must compute the significance test by hand.
Data:
|
0.3
|
1.7
|
-1.2
|
2.2
|
-1.8
|
0.9
|
2.6
|
-3.2
|
0
|
-0.5
|
|
-4.2
|
-8.6
|
0.1
|
0.6
|
8.2
|
0
|
-2.8
|
-5.0
|
0.8
|
5.0
|
|
5.8
|
0.3
|
0.6
|
-5.9
|
1.2
|
-7.8
|
-9.2
|
1.3
|
1.9
|
0.4
|
Report the appropriate null and research hypotheses and the critical value
(alpha = .05). In addition, provide your statistical conclusion, including calculation of test statistic, in APA format and conceptual conclusion in one to two sentences.