Mathematics, 13.08.2021 20:00, psa180
An educator wants to determine how effective tutoring is in raising students' grades in her class, so she offers free tutoring for those who want it. Then she compares final exam grades for the group that took advantage of the tutoring and the group that did not. Suppose the group participating in the tutoring received higher grades on the exam. Does that show that the tutoring worked
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