The results of a two-factor analysis of variance produce df = 1, 30 for the F-ratio for factor A, and df = 2, 30 for the F-ratio for the AxB interaction. Based on this information, how many levels of factor B were compared in the study?

Identifying a problem is the first step in a scientific investigation. This step is derived from which goal of psychology?

a. describing b. explaining c. predicting d. controlling

A child's IQ score offers a way of finding out

A) individual strengths and weaknesses, as well as the mental and chronological age of the child. B) whether the child is ahead, behind, or average in mental development compared to agemates. C) the percentage of younger and older children who fall above or below the child's score. D) how the child compares in mental development to younger and older children.