1. In an ANOVA, you want between treatments variability to be high (HZ point). a. True b. False _ 2. The null hypothesis for an ANOVA states that (U2 point): a. there are no differences between any of the population means b. all of the population means are different from each other e. at least one of the population means is different from the others d. None of the other 3 choices is correct. 3. A psychologist would like to examine the effects of coffee on activity level. Three samples are selected with n = 4 in each sample. A higher score reects higher activity after ingestion. The data from this experiment are presented below. Do these data indicate any signicant differences among the three groups? Test with a single- factor, between-subj ects ANOVA with alpha = .05. No Coffee Decaf Coffee Regular Coffee 1 4 M505 4 3 1 6 0 3 a. What are the null & alternative hypotheses? (2 pts) b. Fill out the source table below - must show work for g three SS computations for full credit. (Tpts) c. What is the critical value? (1 pt) d. Reject or fail to reject? What is the study conclusion (describe group differences if null rejected)? (2 pts) Source SS df MS F Between treatments Within treatments Total 4. A psychologist examines retention of a learned task in a sample of 18 rats. 6 rats are trained on a discrimination task and tested immediately. Six other rats are trained in the same task but tested 5 days later. Finally, 6 more rats are trained and tested 10 days later. Researchers believe there will be a difference in learned ----Jmteal leased on time between testing. A partial ANOVA summary table follows. The data were analyzed 1 Chart Area independent ANOVA. Complete the source table below must ll in ALL spaces (hint start with di) (2 pts). Source SS df MS F Between treatments 25 Within treatments Total 170