_____ is (are) an additional concern that must be evaluated in a within-groups ANOVA compared to a between-groups ANOVA.

Assume a positive correlation is found between the number of hours students spend studying for an exam and their grade on the exam. If the regression equation for these data is calculated and the y intercept is 42, what conclusion can be drawn?

To answer the question of whether the number of adverse childhood events an individual experiences predicts the person’s level of depression at age 20, the researcher should use a:

In addition to traditional findings, the APA now encourages researchers to include additional statistics in the results sections. Which of the following is an example of one of these new statistics?

Do cell phones interfere with a person’s ability to drive? To investigate this question, a psychologist recruits a group of 32 participants and has them drive a simulated test course on two occasions. On one occasion, the participants are instructed to use their phone while driving; on the other occasion, they are instructed to put their phones away. The psychologist records the number of driving errors during two 15-minute driving simulations. The appropriate statistical test is a(n):

A Pearson correlation coefficient is calculated for 60 individuals. What value of df should be used to determine statistical significance in hypothesis testing?

Recent polling finds that 71% of the American public supports same-sex marriage, 27% is opposed to same-sex marriage, and 2% are undecided. To see if students at your university have attitudes that mirror the larger U.S. population, you survey 200 students on your campus on their attitudes toward same-sex marriage. To analyze these data, the most appropriate test would be a:

For the data in the source table, what decision can be made about the hypotheses being tested? Source SS df MS F Between-groups 12.1 2 6.05   Subjects 9.8 4 2.45   Error 11.1 8 1.39   Total 33 14      

When the between-groups variance is much larger than the within-groups variance, we infer that the sample means are _____ one another, and we _____ the null hypothesis.

The following table reflects the results of a study by Roediger and Karpicke (2006). The authors investigated whether the test-enhanced learning effect (the demonstration that repeated testing improves memory for material) was due merely to repeated exposure to the material. They randomly assigned participants to one of two study conditions (study–study or study–test) and to one of three retention interval conditions (final test at a delay of 5 minutes, 2 days, or 1 week). The dependent variable was the proportion of idea units recalled from an encyclopedia passage.Table: Test-Enhanced Learning   5 minutes 2 days 1 week Mean Study–study 0.80 0.55 0.42 0.59 Study–test 0.75 0.70 0.55 0.67 Mean 0.78 0.63 0.49     Reference: Ref 14-1 (Table: Test-Enhanced Learning) Based on the cells of this study, which effects appear to be present?