A Researcher Investigated the Relationship Between Test Length and Grades

question 10

Multiple Choice

A researcher investigated the relationship between test length and grades in a Western Civilization course.After randomly assigning students to groups,she found that students who took longer exams received better grades than students who took shorter exams.The independent variable was

• A) test grades.
• B) gender of the students.
• C) class size.
• D) length of test.

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