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PSYC 355 SPSS Cumulative Assessment Instructions

Instructions for an SPSS-based cumulative psychology assessment.

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    PSYC 355 Page 1 of 15 PSYC 355 SPSS C UMULATIVE A SSESSMENT I NSTRUCTIONS The following research questions can be answered using 1 of the 5 tests you have learned so far: single - sample t - test, paired - samples t - test, independent - samples t - test, one - way ANOVA, or two - way ANOVA. Use the information in the tables to construct your SPSS data file, just as you have been doing in Part 2 of each homework assignment. There is only 1 correct choice of analysis for each question , and note that some tests are 1 - tailed and some are 2 - tailed. The assessment is open - book /open - note s . For each problem involving a test of significance, your answer must include : A) SPSS output ; B) an appropriate graph from SPSS ; C ) a Results section in current APA style including a statistical statement (i.e. , t(19) = 1.79, p = .049 ); a sentence summarizing the results “in English” (i.e. , “There was a significant difference between the two groups on the variable…” or “There was no significant difference…” ); and a decision about the null hypothesis. For ANOVA problems: R eport statistical findings and make statements for all main effects and interaction effects. U se Tukey’s test for any analyses requiring post hoc tests. Do not create a boxplot -- use the graph we typically use in the course for this type of test. Submit this assignment by 11:59 p.m. (ET) on Monday of Module/Week 5. 1. Children who experience chronic pain as a result of medical procedures are the focus of a psychiatrist’s study. Specifically, the psychiatrist wants to measure whether a new program helps d ecrease feelings of chronic pain in the short - term. He measures children’s self - reports of pain levels before treatment on a standardized scale with a range of 0 – 10, with 10 being the most severe. He then administers the new program, and measures children’s pain levels after treatment. Does the new treatment decrease self - reported levels of chronic pain? ( 16 pts) Patient Pain before tx Pain after tx 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 9 5 6 4 3 10 9 9 7 5 2 5 8 3 6 7 7 6 4 3 3 7 6 8 8 4 4 4 5 4 3 4

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    PSYC 355 Page 2 of 15 a) SPSS output Paired Samples Statistics Mean N Std. Deviation Std. Error Mean Pair 1 Pain_after_tx 5.0000 16 1.75119 .43780 Pain_before_tx 6.1250 16 2.44609 .61152 Paired Samples Correlations N Correlation Sig. Pair 1 Pain_after_tx & Pain_before_tx 16 .716 .002 Paired Samples Test Paired Differences t df Sig. (2 - tailed) Mean Std. Deviation Std. Error Mean 95% Confidence Interval of the Difference Lower Upper Pair 1 Pain_after_tx - Pain_before_tx - 1.12500 1.70783 .42696 - 2.03504 - .21496 - 2.635 15 .019 b) SPSS graph

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    PSYC 355 Page 3 of 15 c) Current APA - style Results section A pai red t - test is conducted to test the difference in children pain levels decrease after the treatment compared to before the treatment. The results indicate that average Scores of pain levels after the treatment is less than before the treatment. ( M1=5.0, M2=6.125 S1=1.75,S2=2.45 ). the standard deviation of pain levels after the treatment is less than before the treatment. The differenence in average pain scores is (1.125) t(15)=2.635,p=.019. The Degrees of freedom is 15 . This is left tailed test so the p - value is 0.019/2 Since p - value (0.019 /2 ) is less than 0.05 we reject the null hypothesis at 0.05 level. So w e conclude that that there is signifacant difference in pain scores before and after treatement. 2. A health psychologist in a northern climate wants to evaluate the claim that UV lamps help lower depressive symptoms in middle - aged women. She recruits volunteers who meet the criteria for clinical depression and assigns them to two groups: one group receives a standard treatment for depression and undergoes a half hour of UV lamp therapy each day; the other group receives the same standard treatment for depression but without UV lamp therapy. At the end of two months, she administers a d epression inventory where lower scores indicate fewer depressive symptoms (lower level s of depression). Assume all other variables are controlled for in the study. Evaluate the claim that depression treatment plus the UV lamp results in lower depression scores than depression treatment alone . ( 16 pts ) Depression Treatment + UV Depression Treatment Only

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    PSYC 355 Page 4 of 15 34 29 43 31 29 25 12 14 31 1 7 22 19 27 3 2 39 29 13 41 26 23 47 31 25 14 24 37 4 1 42 a) SPSS output Group Statistics Depression_tr eatement N Mean Std. Deviation Std. Error Mean Depression_treatment_score UV 14 26.0714 8.52566 2.27858 without UV 14 30.8571 10.62549 2.83978 Independent Samples Test Levene's Test for Equality of Variances t - test for Equality of Means F Sig. t df Sig. (2 - tailed) Mean Difference Std. Error Difference 95% Confidence Interval of the Difference Lower Upper Depression_treatment_score Equal variances assumed 1.174 .288 - 1.314 26 .200 - 4.78571 3.64092 - 12.26973 2.69830 Equal variances not assumed - 1.314 24.834 .201 - 4.78571 3.64092 - 12.28687 2.71544

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