Which of the following experiments uses independent samples? You want to compare

Question

Which of the following experiments uses independent samples? You want to compare the mean SAT scores of students before and after they complete a new SAT preparation course. So you compare the mean SAT scores of a randomly selected group of students before and after they completed a new SAT preparation course. You want to compare the mean SAT score of students who take a new sat preparation course to that of students who don't take an sat preparation course. So you compare the mean SAT score of a randomly selected group of students who took a new sat preparation course to the mean sat score of a randomly selected group of students who didn't take an sat preparation course. You want to compare the mean sat score of a randomly selected group of students who took a new SAT preparation course to the national average SAT score.

Explanation / Answer

Option 2 is independent-measures design.

Comparing mean SAT scores of group who took SAT preparation course and who did not take preparation course.

this is because those who take new course and those who do not take new course are independent

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