A researcher wants to know the impact of alcohol on attention. She has forty college students come into her lab. Half of the students are assigned to the alcohol condition and half are assigned to a placebo control condition where they drink a beverage, but it does not contain alcohol. All participants perform two kinds of very basic attention tasks both before and after consuming several beverages. One of the tasks requires the student to have very focused attention while the other task requires the student to have more distributed attention. The researcher collects the focused and distributed attention results for each of the 40 students before and after consuming the beverages.

4. Researchers calculated a regression equation with anxiety predicting depression and found an

15a.  B1 B2 A1 15 20 A2 10 10     Main effect for A: [MainEffectA] Main effect for B: [MainEffectB] Interaction = [Interaction]

7. The results from this study showed that overall, performance on the attention tasks was better in the placebo control condition than in the alcohol condition. This result indicates:

21f. What is your decision to either reject or fail to reject the null hypothesis? (2pt)

10b. List your null and alternative hypotheses. (4pts)

10. Based on the conventions for ƞ2 effect sizes the effect for Darren’s study would be considered ___________.

Dan got a 60 on his social psych exam. The class average was 70 with SD = 4. Chris got an 80 on his cognitive psych exam. The class average was 95 with SD = 6. Who did better, compared to the rest of his class?

Continuing to be interested in satisfaction, we ran a separate study to see how satisfied MSU students were with three classes: statistics, personality psychology, and social psychology with 14 students sampled in each condition. Below are the means and the ANOVA table.   SS df MS F Between 81.33 2 40.67 10.65 Within 148.79 39 3.82   Total 230.12 41    

10i. Write your results in APA format. (4pts)