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Which is not a reason for using ANCOVA:
to control for some pre-existing characteristic of subjects which may affect scores on the outcome variable
in place of a well-controlled laboratory experiment that uses random selection and assignment
Interpret the effect size ( η 2) for the ANCOVA: F(2, 57) = 7.9, p = .001, partial η 2 = .43.
Which of the following is a null hypothesis for the averages
of three groups in a one-way, between-subject ANOVA?
1. H0: Average1 ≠ Average2 = Average3
2. H0: Average1 ≠ Average2 ≠ Average3
3. H0: Average1 = Average2 = Average3
4. H0: Average1 = Average2 ≠ Average3
If the null hypothesis is rejected in a one-way ANOVA with three groups, we can infer that:
a. There is a significant difference in means for each of the three possible group pairings.
b. There is no significant difference in means for each of the three possible group pairings.
c. There is probably at least one significant difference in means among the three possible group pairings.
d. There is a significant difference in means for at least two of the three possible pairings.
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