Part 2 – SPSS APPLICATION from this week’s assignedreadings and presentations (28 pts)

Problem Set 1: The independent-samples t test(7 pts) Research Scenario: A clinical psychologist isstudying whether there is a difference between veterans diagnosedwith PTSD and veterans without PTSD in reduction of anxiety afteraerobic exercise. All veterans in this study agree to complete 30minutes of aerobic exercise 5 days a week for 4 weeks and beganwith similar levels of reported anxiety. Scores shown arecalculated difference scores in anxiety, with higher scoresindicating more of a reduction in anxiety (scale measurement). Using this table, enter the data into a new SPSS datafile and run an independent samples t test to test whetheraerobic exercise differentially affects anxiety in veterans withand without PTSD. Remember to name and define yourvariables under the “Variable View,” then return to the “Data View”to enter and analyze the data. Remember, data will be entereddifferently than in a paired samples t-test. Specifically,you will have one variable (“Group”), with 0 = no PTSD and 1 =PTSD. The other variable is “Change”. Thus, data will not beentered exactly as shown below.

NoPTSD	PTSD
24	25
23	23
22	27
30	19
31	22
30	13
38	18
25	28
33	21
38	31

1. Paste relevant SPSS output. (2 pts)

2.     Create an appropriate graph to displaythis data. (2 pts)

3. Write an APA-style Results section based on your analysis. Allhomework “Results sections” should follow the examples provided inthe presentations and textbooks. They should include thestatistical statement within a complete sentence that mentions thetype of test conducted, whether the test was significant, and ifrelevant, the effect size. Don’t forget to include a decision aboutthe null hypothesis. (3 pts)

Problem Set 2: Pearson’s correlation (7pts) Research Scenario: Is there a positiverelationship between grit and dieting success? A researcherexamined this issue by having people complete a grit inventoryusing a Likert-based scale (range 1 – 7), where higher numbersindicate more “grit”. Dieting success was measured using alikert-based inventory as well, with higher numbers indicating moresuccess (range 1-7). Enter the data shown here into SPSS to run ananalysis to test whether increased grit is associated with higherdieting success. Grit Success 3.5 2.3 2.0 1.1 1.7 0.3 1.8 0.1 2.7 0 3.5 0.7 3.9 3.7 4.1 5.5 3.5 3.7 4.7 6.7 5.1 5.9 3.2 5.3 5.6 4.4 4.1 2.8

4.     Paste relevant SPSS output. (2pts)

5.     Create an appropriate graph to displaythis data. (2 pts)

6.     Write an APA-style Results sectionbased on your analysis. All homework “Results sections” shouldfollow the examples provided in the presentations and textbooks.They should include the statistical statement within a completesentence that mentions the type of test conducted, whether the testwas significant, and if relevant, coefficient of determination andits interpretation. Don’t forget to include a decision about thenull hypothesis. (3 pts)

Note: Please solve it by text not in hand written form.