1. If you reject the null hypothesis for the interaction in a two-factor ANOVA, you know that you will also reject the null hypothesis for at least one main effect. (lpt) True or False 2. A two-factor experiment means that the experimental design includes (lpt) a. two independent variables b. two dependent variables c. two groups of participants 3. A psychologist examines retention of a learned task in a sample of 6 rats. At 90 days the rats are trained on a discrimination task. Their initial performance is recorded to serve as a baseline. Then their performance is tested again at 6 months, 1 year, 1.5 years, and 2 years. A partial ANOVA summary table follows. The data were analyzed using a repeated-measures ANOVA. Answer the following: (4pts) a. What are the null and alternative hypotheses? b. Complete the source table below. c. What is the critical value using an alpha of .05? d. Should she reject or fail to reject the null hypothesis? Source SS df MS F Between treatments 1 1 Within treatments Between subjects Error 40 Total 152 S. The following data are 'om a study that looked at the following variables: job commitment, training, and job performance. Job performance was the dependent variable (mean performance ratings are shown below) and commitment and training were independent variables. Both main effects and the interaction were tested. The study used 11 = 10 participants in each condition (cell). (9pts) Means: Job Commitment L0w Medium High Trained 1 2.5 4 Not Trained 1 1 1 z"- m .3. F\" 0' w Answer the following questions using the above means or the graph (consider any difference > 0 a signicant e'ect): N 0' Job Forum-nu N a. What are the null and alternative hypotheses? b. State the degrees of freedom for: total, between, within, factor A, factor B, and interaction. c. Does there appear to be a main effect for training? Yes or No d. Does there appear to be a main effect for job commitment? Yes or No e. Does there appear to be a signicant interaction? Yes or No f. What can you conclude? (Be specic You must describe the reSults of the stud .. v.7- p v- It: Job Commitment Laval