Part 2 – SPSS APPLICATION from this week’s assigned readings and presentations (28 pts) |
Problem Set 1: The independent-samples t test (7 pts) Research Scenario: A clinical psychologist is studying whether there is a difference between veterans diagnosed with PTSD and veterans without PTSD in reduction of anxiety after aerobic exercise. All veterans in this study agree to complete 30 minutes of aerobic exercise 5 days a week for 4 weeks and began with similar levels of reported anxiety. Scores shown are calculated difference scores in anxiety, with higher scores indicating more of a reduction in anxiety (scale measurement). Using this table, enter the data into a new SPSS data file and run an independent samples t test to test whether aerobic exercise differentially affects anxiety in veterans with and without PTSD. Remember to name and define your variables under the “Variable View,” then return to the “Data View” to enter and analyze the data. Remember, data will be entered differently 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 be entered 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 |
SPSS OUTPUT:
Group Statistics |
|||||
GRP |
N |
Mean |
Std. Deviation |
Std. Error Mean |
|
ANXIETY |
No PTSD |
10 |
29.40 |
5.854 |
1.851 |
PTSD |
10 |
22.70 |
5.314 |
1.680 |
Independent Samples Test |
||||||||||
Levene's Test for Equality of Variances |
t-test for Equality of Means |
|||||||||
F |
Sig. |
t |
df |
P VALUE |
Mean Difference |
Std. Error Difference |
95% Confidence Interval of the Difference |
|||
Lower |
Upper |
|||||||||
ANXIETY |
Equal variances assumed |
.202 |
.659 |
2.680 |
18 |
0.015 |
6.700 |
2.500 |
1.448 |
11.952 |
Equal variances not assumed |
2.680 |
17.834 |
0.015 |
6.700 |
2.500 |
1.444 |
11.956 |
Part 2 – SPSS APPLICATION from this week’s assigned readings and presentations (28 pts) Problem Set...
Part II: SPSS Application These questions require the use of SPSS. Remember you must submit all of your work within this word document. You will need to take a screen shot of your data view if necessary, or copy and paste your output into the spaces below. Remember to report the exact p value provided by SPSS output – simply reporting p<.05 or p>.05 is not acceptable (unless SPSS output states p=.000 – in that case you can report p<.001)....
Part II: SPSS Application These questions require the use of SPSS. Remember you must submit all of your work within this word document. You will need to take a screen shot of your data view if necessary, or copy and paste your output into the spaces below. Remember to report the exact p value provided by SPSS output – simply reporting p<.05 or p>.05 is not acceptable (unless SPSS output states p=.000 – in that case you can report p<.001)....
Part II: SPSS Application These questions require the use of SPSS. Remember you must submit all of your work within this word document. You will need to take a screen shot of your data view if necessary, or copy and paste your output into the spaces below. Remember to report the exact p value provided by SPSS output – simply reporting p<.05 or p>.05 is not acceptable (unless SPSS output states p=.000 – in that case you can report p<.001)....
Problem Set 2: Two-way mixed design ANOVA (8 pts) Research Scenario: A researcher is attempting to determine the effects of age and sleep deprivation on a reaction time task. Participants (5 “old”; 5 “young”) in an experiment are given a computerized search task. They search a computer screen of various characters and attempt to find a particular character on each trial. When they find the designated character, they press a button to stop a timer. Their reaction time (in ms)...
General Psychology: Clinicians at a small clinic have been introduced to a new method to treat post-traumatic stress disorder (PTSD) in their clients for veterans. Research indicates that virtual reality (VR) is a highly effective treatment option for patients with PTSD. Currently, the clinic uses only cognitive processing therapy (CPT) with their patients suffering from PTSD. The clinicians would like to find out whether VR therapy has different results from CPT therapy. The measure used by the clinic to measure...
A study was conducted to determine if a walking plus strength training exercise program results in a significantly greater increase in aerobic capacity as compared to a walking only exercise program. Participants are randomly selected and then randomly assigned to one of the exercise groups. Participants’ aerobic endurance was assessed at the beginning of the study and, again, after 6-months of exercise. Coding for study variables: AGE—age in years SEX—1 =male, 2=female EXERCISE—1= walking and strength training; 2 = walking;...
Problem 5 Each year, the Chapman University Survey of American Fears asks a random sample of Americans whether they are afraid of various issues. One question on the survey asks about air pollution. The table below reports the number of individuals surveyed in 2018 who responded that they were either afraid or not afraid of air pollution, by political affiliation. Republican Independent Democrat Total Not afraid of air pollution 61 94 28 183 Afraid of air pollution 263 367 376...
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Price Lot size Trees Distance 89.7 21.8 45 62 136.1 66.3 79 34 44.7 28.2 53 77 63.2 41.9 64 65 163.4 46.7 69 27 64.1 32.1 12 0 98.7 38.5 59 77 139.9 27.6 10 0 92 47 65 37 66.6 20.7 24 51 16.4 34 22 75 131.9 31.9 56 63 11 28 12 42 27.9 40 52 84 103.5 46.6 36 70 107 23.2 11 83 51.6 46.4 53 44 133.4 32.1 55 98 101.4 35.3 38...
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