The omnibus null hypothesis when performing an analysis of variance is that there are differences between group means; however, no prediction is made concerning where the differences lie.

False, the omnibus null hypothesis is that all population means are the same.
false
True
true
False
Unlike t tests, an ANOVA may be used to test for differences among more than 2 groups.

True, an analysis of variance (ANOVA) is most often used to determine if there are differences among 3 or more group means. However, when there are more than 2 groups, an ANOVA does not provide information regarding where the differences lie.
true
True
false
False
It is valid to do the Tukey HSD test without first finding a significant effect with an ANOVA.

True, the Tukey HSD controls the Type I error rate and is valid without first running an ANOVA.
true
True
false
False