Free SAT Practice Question

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ID: SAT-MATH-PSDA-030
Section: SAT Math - Problem Solving & Data Analysis (PS&DA)
Topic: Inference from sample statistics and margin of error
Difficulty level: Hard

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A researcher wanted to know whether working through a new online grammar tutorial improves students' scores on a writing quiz. She selected \(400\) students at random from all students enrolled at a large university and randomly assigned each selected student to one of two groups: one group worked through the tutorial and the other did not. Afterward, both groups took the same writing quiz, and the tutorial group's mean score was significantly higher than the other group's. Which of the following is the most appropriate conclusion?

AThe tutorial improves writing-quiz scores for students at colleges and universities in general.

BFor the students studied, the tutorial is associated with higher writing-quiz scores, but it is not possible to conclude that the tutorial caused the higher scores.

CThe tutorial caused an improvement in writing-quiz scores, and this conclusion can be generalized to the students enrolled at this university.

DScoring higher on the writing quiz caused students to work through the tutorial.

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