An instructor randomly assigns two sections of his course to an experimental condition (new teaching method)or control condition (regular teaching method).Students in the 9:30 section receive the experimental treatment and students in the 1:30 section participate in the control condition.At the end of the semester the instructor's tests reveal that students in the 9:30 section had significantly higher test scores than students in the 1:30 section.Based on this summary,we can state that

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Quizplus · Accepted Answer

The use of intact groups (the 9:30 and 1:30 sections) rather than randomly assigning individual students to conditions means that any number of uncontrolled variables could account for the difference in test scores, making the results uninterpretable in terms of the effectiveness of the teaching methods.

An Instructor Randomly Assigns Two Sections of His Course to an Experimental