*4. A researcher randomly assigns six students with behavioral problems to three treatment conditions (this, of course, would be far too few participants for practical study). At the end of three months, each student is rated on the ormality" of his or her behavior, as determined by classroom observations. The results are as follows:

Behavior Ratings for Each of Six Students Treatment 1: 3, 7 Treatment 2: 4, 10 Treatment 3: 6, 12

(a) State H0 in symbolic form; express H1 in words.

(b) Calculate SSwithin, SSbetween, and SStotal.

(c) What are the values for dfwithin, dfbetween, and dftotal?

Exercises 343

(d) Compute s2 within, s2 between, and F.

(e) What is the statistical decision (a ¼ :05) and final conclusion?