Question

1. A researcher team reports that the elementary school students who were served orange juice during the science test had higher scores than the students who did not given orange juice. For this study, what is the independent variable?

• A. the students who were not served orange juice.

• B. the performance on the science test.

• C. the students who were served orange juice.

• D. whether or not orange juice was served.

2. A researcher team reports that the elementary school students who were served orange juice during the science test had higher scores than the students who did not given orange juice. For this study, what is the dependent variable?

• A. whether or not orange juice was served.

• B. the performance on the science test.

• C. the students who were not served orange juice.

• D. the students who were served orange juice.

3. A researcher wants to find out if there is a relationship between test anxiety and student’ test performance. He randomly selected a sample of n = 120 high school students. All students were given a brief questionnaire to assess their anxiety level before taking the test. The researcher recorded the anxiety score and the test score of each student. What statistical test should be used by the researcher to find out if there is a significant correlation between test anxiety and test performance?

• A. Chi² for Goodness of Fit.

• B. One-factor Anova for independent samples

• C. T-test for independent samples.

• D. Chi² for Independence.

• E. Pearson correlation.

• F. T-test for dependent samples.

4. What is evaluated by the Chi² test for Independence?

• A. The relationship between two nominal variables.

• B. The difference between mean scores of two or more samples.

• C. The differences in distribution of frequencies between categories of one nominal variable.

• D. None of the above.

Answer 1

Answer: 1. A researcher team reports that the elementary school students who were served orange juice during the science test had higher scores than the students who did not given orange juice.

For this study, what is the independent variable?

The option D. is correct answer.

The independent variable is whether or not orange juice was served.

2. For this study, what is the dependent variable?

The option B. is correct answer.

The dependent variable is the performance on the science test.

3. A researcher wants to find out if there is a relationship between test anxiety and student’ test performance. He randomly selected a sample of n = 120 high school students. All students were given a brief questionnaire to assess their anxiety level before taking the test. The researcher recorded the anxiety score and the test score of each student.

What statistical test should be used by the researcher to find out if there is a significant correlation between test anxiety and test performance?

The option D. is correct answer.

The Chi2 for Independence

4. What is evaluated by the Chi2 test for Independence?

The option A. is correct answer.

The relationship between two nominal variables.