1. Quiz 11  Analysis of Variance (ANOVA)  post hoc tests

2. 1. Which condition is not necessary before conducting an ANOVA? a) data must be normally distributed or nearly so b) groups must be dependent c) group variances must be equal (i.e., variances are homogeneous) d) data must come from random sampling

3. 2. What is the critical F value for a study involving the means of 4 groups of 10 people in each, given =0.05? a) 8.6166 b) 8.5944 c) 2.9223 d) 2.8387

4. 3. What is the correct F-ratio for the following ANOVA summary table given 10 subjects per group and 4 groups? a) 0.454 b) 6.049 c) 4.537 d) 5.444

5. 4. Which is the correct test to use when you want to compare three groups of different participants and the data are normally distributed data? a) Kruskall-Wallis b) t-test for independent groups c) analysis of variance d) test of independence

6. 5. The F-distribution is a distribution with all the following characteristics excepting _______? a) area under curve is equal to one b) distribution is symmetrical c) is skewed positively d) it is asymptotic to the right

7. 6. Given the following SPSS output what can you conclude about the relationship between number of defects (DV) and brand of appliance (IV)? a) there is at least one significantly different group b) all groups are significantly different c) all groups have equal means

8. 7. Which post hoc test is the most conservative and has the least power? a) Scheffé b) Tukey HSD c) Bonferroni d) Duncan’s multiple range

9. 8. Given the following SPSS output which is the correct conclusion? a) E different from VGb) no differences c) E different from G d) VG different from G