Multiple Choice
A tutor promises to improve GMAT scores of students by more than 50 points after three lessons. To see if this is true, the tutor takes a sample of 49 students' test scores after and before they received tutoring. The mean difference was 53 points better after tutoring, with a standard deviation of the difference equal to 12 points. Let µD denote the mean of the difference: score after tutoring minus score before tutoring. Which of the following is the correct value of the test statistic?
A) z = 1.7143
B) z = 1.7500
C) t48 = 1.7143
D) t48 = 1.7500
Correct Answer:
Verified
Correct Answer:
Verified
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