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A researcher is interested in whether there are differences in mood after running in a group or running alone. The researcher randomly selects 100 runners, assigns and has 50 of the runners complete a solo run and the other 50 complete a run in group settings. The researcher assess mood after the run for all participants. How should the alternative hypothesis be stated for a non-directional, independence samples  t test?

Which of the following line plots indicate that there is no interaction effect: Plot A Plot B Plot C Plot D Plot E

A sample of n = 20 scores produces a t statistic of t = -3.50. What is the value of the effect size,  r2?  (round to 2 decimal places)

How many F ratios are created in a two-factor ANOVA?

An research study compares three treatment conditions using a sample of n = 4 in each treatment. For this study, the three samples have SS1 = 62.75, SS2 = 9, and SS3= 8.75. What value would be obtained for MSwithin?

Health researchers conduct a study comparing major depressive disorder rates in high school students to the nationwide average of 15. Researchers select a sample of 30 students who have a mean score of 20 (S= 6.5). Calculate the t statistic  (round to 2 decimal places)

Using a one-way ANOVA, a researchers reports an F ratio with df = 1, 25. This researcher could have used a t test. 

Outliers can change the ______ of a correlation.

A researcher reports that the mean difference in the body weight of rats following a pharmacological treatment versus control is 18 g, with a pooled sample variance of 272. Calculate the Cohen’s d  (round to 2 decimal places)

Did I ask you anything that was not covered in the course materials (e.g., lectures, HW, book)? If yes, please specify in what question(s).