Use the following information to answer the three questions below. A researcher examined how different therapies might benefit veteran and non-veteran participants from feeling guilty, which was measured via a validated online questionnaire. Veterans and non-veterans were randomly assigned to one of the three therapy groups: a) emotion-focused therapy, b) forgiveness therapy, and c) a control group without any therapy. Question 1: The researcher found that veterans scored much higher on guilt than non-veterans in the control group; however, the difference in guilt between the veterans and non-veterans was almost negligible in the two therapy groups. The results suggest: A main effect of participant group only A main effect of participant group, and an interaction between therapy and participant group O A main effect of therapy, and an interaction between therapy and participant group A main effect of therapy only O An interaction between therapy and participant group, cannot tell the main effects Question 2. Which of the State syntax commands should I use to obtain a marginal and cell mean table? O tab therapy participant_group, summarize (guilt) O by therapy participant_group, sortisummarize guilt, detail O tab guilt over(therapy) over(participant_group) O tabstat guilt, by (therapy participant_group) stat(n mean sd) Question 3. Now, imagine the researcher had an a priori prediction of the main effect of therapy. Specifically, the two therapy groups (a and b) should help with participants' feelings of guilt, and therefore, score significantly lower on guilt than the control group (c). How would the researcher set up linear contrasts to conduct a secondary analysis on the main effect of therapy to test this prediction? O Assign contrast coefficients as follows: a(2), b(-1), c(-1) O Assign contrast coefficients as follows: a(1), b(1), c(-2) O Assign contrast coefficients as follows: a(1), b(0), c(-1) O Assign contrast coefficients as follows: a(1), b(-2), c(1) Assign contrast coefficients as follows: a(-1), b(1), c(0) and a(0), b(1), c(-1)