Question

8. A statistics professor is interested in whether having lab period on the same day as lecture leads to more positive attitudes during lab than having lab period on a different day than lecture. She uses the students who chose to take statistics in two different semesters - one class in Fall 2018 (lecture on same day) and one in Spring 2019 (lecture on different day) - to test the hypothesis. If there are differences in the attitudes toward lab between the two classes, unsystematic variation could mean: a. differences in personalities produced by differences in attitudes toward lab periods. b. differences in attitudes produced by differences in whether the lab was on the same or different day than lecture. c. differences in attitudes produced by differences in the types of students who choose to take statistics in the fall versus in the spring. d. None of these. 9. As an example of a test-statistic, the t-statistic is a ratio of: a. error variance to variance explained by the model b. variance in the outcome explained by the predictor/independent variable to variance in the outcome unexplained by the predictor/independent variable c. error variance to total variance d. variance in the predictor explained by the outcome/dependent variable to variance in the predictor unexplained by the outcome/dependent variable

Answer 1

Answer: 3) ofboy с differences in attitudes produced by differences in the types of students who choose to take statistics in the fail versus in the spring. unsystematic Variation = Measurement Errort & Individual differences ? 9) option b variance in the outcome explained by the predictor/ independent variable to variance in the outcome unexplained by the predictor) independent variable I Test-Statistic (t) - variation blo Samples ) Variation within fameles