Professor Sui predicts that students will learn better with adding animations and sound effects in the PowerPoint slides. She randomly puts 21 students into three different groups to complete one assignment. The first group of students study with PowerPoint slides without any animations and sound effects; the second group uses the PowerPoint slides with animations but without any sound effects; and the third group studies using PowerPoint slides that have both animations and sound effects. After the assignment is completed, the students are asked to take an MCQ test for 10 points. Their results are recorded in the accompanying table. Test the null hypothesis that Professor Sui’s claim is true.

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Source of Variation Between groups Within groups Total Sum of Squares 50.62 85.78 136.3 Degrees of Freedom 2 18. 20