PSYC 355 SPSS H OMEWORK 3 I NSTRUCTIONS O NE -W AY ANOVA Part 1: Green & Salkind: Lesson 25, Exercises 1–3 The following helpful tips are numbered to correspond with the exercise number to which they refer (a dash indicates that no tips are needed): 1. Use Tukey’s test as the post hoc test for ANOVAs in PSYC 355. Be sure to check this box when you run analyses. For letters a–d, instead of identifying these values on your output, as the text states, write them into your Word file as written answers for #1 a, b, c, and d. (2 pts for output and 2 pts each for a–d) 2. ---------- (3 pts) 3. Remember to put your dependent variable in the “variable” box, and your independent, or grouping, variables in the “category axis” box. (3 pts) Part 2: 1. Sixth grade students who struggle with similar social difficulties at school and home are randomly assigned to 1 of 3 group therapy conditions in order to improve their social skills: manualized cognitive-behavioral therapy (MCBT), non-manualized cognitive-behavioral therapy (NMCBT), and talk therapy (T). Following 2 months of therapy, the students are assessed on a standardized measure of social skills. On this instrument, scores range from 0– 65, and higher scores indicate better or improved social skills, while lower scores indicate social skills that need improvement. These scores are shown in the table below. Conduct a one-way ANOVA to determine how effective these 3 therapy conditions are at improving social skills. The steps will be the same as the ones you have been practicing in Part 1 of the assignment— the only difference is that you are now responsible for creating the data file as well. Remember to name and define your variables under the “Variable View,” then return to the “Data View” to enter the data. (3 pts) MCBT 39, 32, 36, 33, 32, 37, 37, 38 NMCBT 32, 30, 28, 26, 31, 27, 29, 26 T 25, 31, 24, 26, 26, 30, 27, 25 2. What is the F ratio for the therapy group main effect ? (3 pts) 3. What is the effect size for the overall effect of therapy type on social skills scores? According to general conventions, is this effect small, medium, or large? (3 pts) Page 1 of 2
