Please note that for all problems in this course, thestandard cut-off (alpha) for a test of significance will be .05,and you always report the exact power unless SPSS output statesp=.000 (you’d report p<.001). Also, remember that we divide thep value in half when reporting one-tailed tests with 1 – 2groups.
Problem Set 2: (8 pts) Research Scenario: Does distraction and/oramount of details affect the ability of people to make gooddecisions? In this fictitious scenario, researchers used awithin-subjects design. Participants (N=15) were given fourdifferent scenarios based on amount of details (4 or 14) anddistraction level (no distraction or distraction), and were askedto make an objective decision at the end of each scenario.Objective decision was the dependent variable and was quantifiednumerically using an interval scale of measurement. Eachparticipant provided four objective decisions – one for eachcondition. Assume the data is parametric. Select and conduct themost appropriate statistical test to determine whether distractionand/or amount of details affect people’s ability to make gooddecisions. Hint: since this is within subjects, each levelfor each factor will have its own column of data, so you will have4 columns of 15 rows of data in your SPSS data view. You willanalyze two factors (“Distraction” and “Details”) and each factorhas 2 levels. Please label your columns “NoDistract4”,“NoDistract14”, “Distract4”, and “Distract14”. | No Distraction | | Distraction | 4 details | 5.5 | 5.2 | 5.3 | 4.7 | 4.9 | | 2.5 | 2.1 | 2.3 | 2.4 | 2.7 | 4.8 | 5.1 | 5.2 | 5.4 | 5.7 | | 2.9 | 3.0 | 2.0 | 2.1 | 2.4 | 5.3 | 5.1 | 5.9 | 6.0 | 5.7 | | 1.7 | 2.5 | 2.7 | 2.3 | 2.1 | | | | | | | | | | | | | 14 details | 0.8 | 1.2 | 1.5 | 1.2 | 1.3 | | 4.7 | 5.8 | 5.3 | 4.9 | 4.8 | 1.1 | 0.5 | 0.3 | 1.0 | 0.7 | | 5.7 | 5.5 | 5.1 | 5.3 | 5.1 | 1.4 | 1.1 | 0.9 | 1.3 | 1.2 | | 5.6 | 5.0 | 4.3 | 4.8 | 4.9 |
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- Paste appropriate SPSS output. (4 pts)
- 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, effect size and/or post hoc analyses. Don’t forget toinclude a decision about the null hypotheses. (4 pts)
