Dr. Draper investigated the relationship between the number…

Dr. Draper investigated the relationship between the number of class periods students attended in his research methods course and the score on the final exam. He found that students who attended more classes received better grades than students who attended fewer classes. The independent variable was

A young researcher is interested in whether seniors spend mo…

A young researcher is interested in whether seniors spend more time than freshman studying in the library. Having obtained the percent of students who are freshman and seniors from the administration, the researcher proceeds to ask seniors and freshman how much time they spend in the library, making sure the sample matches the correct % for freshman and seniors, respectively. The researcher has used