Fifty (50)students took a math test before and after tutoring.Of the 50 students,34 showed an improvement and 2 showed no change.After ranking the remaining 48 differences (before - after),it is found that T- = 873 and T+ = 303.Do the data suggest that the tutoring improves math scores? Conduct a Wilcoxon signed rank test using a 0.01 level of significance.

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Quizplus · Accepted Answer

The Answer is H0: The distributions of math scores were identical before and after tutoring. HA: Math scores tend to be generally higher after tutoring. E(T+ orT-)= 588,Var(T+ orT-)= 9506 Test Statistic: z = -2.92,P-value = 0.0018 Reject the null hypothesis.There is sufficient evidence to suggest that tutoring improves math scores.

Fifty (50)students Took a Math Test Before and After Tutoring