Applicants to MBA programs must take the Graduate Management Admission Test (GMAT). There are several companies that
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Applicants to MBA programs must take the Graduate Management Admission Test (GMAT). There are several companies that offer assistance in preparing for the test. To determine whether they work, and if so, which one is best, an experiment was conducted.
Several hundred MBA applicants were surveyed and asked to report their GMAT score and which, if any, GMAT preparation course they took. The responses are course A, course B, course C, or no preparatory course. Do these data allow us to infer that there are differences between the four groups of GMAT scores?
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