Individual differences could obscure a true difference between groups. Apply this principle to the example of the GRE study described in Chapter 10 (pp. 293–295). Using your understanding of individual differences, determine what individual differences might be relevant to the GRE preparation course. That is...1. What individual differences might interfere with your ability to see group differences in GRE scores?2. Could you use a repeated-measures design to control for these individual differences? Why or why not?3. How would a matched-pairs design help control for individual differences in the GRE prep course study? What steps would be necessary to complete a matched-pairs design?

A GRE course prep company advertises that its course can significantly raise students’ GRE Verbal Reasoning scores. In order to assess the accuracy of this claim, a researcher randomly selected two independent samples of 30 graduating seniors from a local university, who were applying to business school. One group of 30 students took the GRE, without any preparation. The other group of 30 students took the GRE after completing a GRE prep course. The researcher then compared the performance for the two groups to determine whether there was difference on the GRE Verbal Reasoning scores from group without any preparation and the group completing the GRE prep course.What hypothesis testing technique should the researcher use to analyze the data? ANOVA z-test for the population mean Two-sample t-test Paired t-test

Andrew is getting ready to apply to graduate school. He and some friends took a GRE preparation class. Most class members scored around 154 on the quantitative portion of the GRE. A few class members scored around 105 on the quantitative portion. Which of the following would be the best measure to see how Andrew's score on the quantitative portion of the GRE compares to the rest of the scores of the GRE preparation class members?Group of answer choicesModeStandard DeviationMedianPercentileMean

Which one of the following is the most accurate statement about group differences among students?Question 31Select one:A.When we have knowledge about typical group differences, we have a very good idea of how individual students are likely to perform in the classroom.B.We can make fairly accurate predictions about individual students when we know their ethnic background, but not when we know their gender.C.We can make fairly accurate predictions about individual students when we know their gender, but not when we know their ethnic background.D.The average for two groups may be different, but variability within each group keeps us from predicting individual performance.

Question 7Select the research example for which a one-way between-groups ANOVA would be the appropriate test.1 pointResearchers want to test for a difference in memory scores before and after a new memory technique is introduced.Researchers want to examine the relationship between the number of class absences and final course grade.Researchers compared the mean difficulty rating of math problems among groups of participants who experienced a positive stressor, a negative stressor, or no stressor, respectively.College administrators are interested in whether high school GPA predicts college GPA.

The best use of a study group is to ...Group of answer choiceshave your questions answered.come prepared to discuss appropriate materials.receive tutoring.socialize.