Practice Quiz

Chapter 12
Understanding Research Results: Description and Correlation

Here are some questions for a practice quiz. The questions are multiple-choice and true-false. They may not resemble the questions that your instructor may ask on a test. That is, the questions on your class exams may be more difficult and may include essay and short answer questions.

When you get your score, you will be shown the correct answers. Take the quiz as many times as you like. If this quiz does not work using Netscape Navigator, try it with Internet Explorer.

1. You want to know if males and females differ in preferences for dogs and cats as pets. You ask males and females to indicate whether they prefer dogs, cats, or neither dogs nor cats. When you describe your results, you will compare:
means.
percentages.
medians.

2. You want to know if males and females differ in the length of recommended sentence for someone found guilty of driving under the influence of alcohol. You ask males and females to indicate the number of weeks of jail time the convicted person should receive. When you describe your results, you will compare:
means
percentages
medians

3. If you are using a nominal scale, the standard deviation is the best measure of variabilility of responses.
True
False

4. You conducted a survey of students in your school. You report that half the students work 25 hours per week or less. The statistic you used is the
mean.
median.
mode

5. Couples who share more similar attitudes indicate that they are more satisfied with their relationship. This reflects a ___________ correlation.
positive
negative

6. A correlation coefficient provides information about the strength of the relationship between variables.
True
False

7. A researcher assessed the following variables in a sample of teenage males: aggressive behavior, anger, loneliness, and perceived social support from family and friends. In addition to examining the correlations among these variables, the researcher tested a proposed model of how these variable are related to one another. The researcher is using a:
partial correlation analysis.
structural equation model.
multiple regression analysis.

8. You believe that the relationship between the two variables you are investigating is curvilinear. The Pearson product-moment correlation coefficient will provide a good index of the strength of this relationship.
True
False

9. You expected to find that age is related to more conservative political attitudes. However, your study found that the two variables were not related. Before you conclude that the two variables are not related, you should examine the range of values on your age variable.
True
False

10. A multiple correlation is a correlation between one variable and
another variable that is measured on a ratio scale.
a combined set of variables.
a manipulated variable.

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