6&7

VE 01:15:24 Time Remaining Return Submit The following summary table contains data from an experiment comparing the efficacy of different types of treatment of major depression. Participants in this study were randomly assigned to receive one of several different therapies for major depression, and their mood was measured before and after treatment. How many types of treatment were compared? Account Source SS df MS F Between 100 14 Dashboard Within Total 44 5 Courses 1 6 Groups 3 2 O 4 Calendar 3 7 1 point Inbax A researcher wants to test whether participating in support groups will boost the immune system of people with AIDS. Her expectation is that participation will enhance immune functioning. For this purpose, she recruits 20 AIDS patients and randomly assigns half to an hour-long support group that meets once a week for six months and half to a solitary activity of the same duration and frequency. The table below presents the data she collected after the 6-month intervention. A higher score indicates 5 History better immune functioning. The immune functioning of the two groups was the same prior to the intervention. You can proceed as if all of the assumptions for the relevant statistical test to be valid have been met. (?) 6 Support Solitary Help Group Activity Mean 11 13 7 Var 5 5 Student Resources What is the observed value of the test statistic? 0 -17 -25 -1 10 -2