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 hypotheses will determine if the students improved their test scores by more than 50 points after being tutored?
A) H0: µD ≤ 0,HA: µD > 0
B) H0: µD ≥ 0,HA: µD <0
C) H0: µD ≤ 50,HA: µD >50
D) H0: µD ≥ 50,HA: µD <50
Correct Answer:
Verified
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