To obtain certification for a certain occupation, candidates take a proficiency exam..The exam consists of two sections, and neither section should be more difficult than the other. To investigate whether one section of the exam was more difficult than the other, a random sample of 50 candidates was selected. The candidates took the exam and their scores on each section were recorded. The table shows the summary statistics.

Which of the following is the test statistic for the appropriate test to determine if there is a significant mean
difference between the percent correct on the two sections (first minus second) for all candidates similar to those in the investigation?
(A) V50 75 - 65
(B) 1 = 1102 8 52 + 50
(C) 50 Xox- (75 - 70,2 (65 – 7012 70 70
(D) 75 - 702 (65 - 70) 65