In analysis of variance, what is a factor?

Which of the following is NOT an assumption made when calculating a factorial/two-factor ANOVA?

A set of N = 10 scores has a mean of µ = 50.  If 20 points are added to one of the scores, what is the new value for the population mean?

A repeated measures study uses a sample of 25 participants to evaluate the mean differences among 7 treatment conditions. In the analysis of variance for this study, what is the value for dfwithin groups?

Using letter grades (A, B, C, D, and F) to classify student performance on an exam is an example of measurement on a(n) ____ scale of measurement.

A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population.  If the researcher uses a one-tailed test with alpha = .01, then which of the following correctly identifies the critical region?

What is the critical value for a correlation with n=25, two-tailed, and an alpha level of 0.05?

For an independent-measures t statistic, what is the effect of increasing the number of scores in the samples?

Which of the following is an accurate definition of a Type II error?

Two samples, each with n = 8, produce an independent-measures t statistic of t = –2.15.  Which of the following decisions is justified?