13. When reporting the results of a linear regression, most people just give the r2 and degrees of freedom, but there is a means to provide a significance value utilizing the t-distribution.

14. 2-way ANOVA, assumes normal data distribution equal standard deviations.

15. For two-sample t-test the most powerful research design will be to have an equal sample size in each group (N1/N2=1.0).

16. The null hypothesis for a paired t-test is that the mean difference between paired observations is one. When the mean difference is one, the arithmetic averages of the two groups must also be equal.

17. In 2-way ANOVA without replication, you calculate the mean square for each of the two main effects and calculate a total mean square by considering all of the observations as a single group.

18. In biology, the within-group variation is often largely the result of real, biological variation among individuals.