A Random Sample of 11 Third-Year Medical School Students Took

A random sample of 11 third-year medical school students took a comprehensive written exam as well as a comprehensive oral exam.The scores on both exams are given below.It is established that both test scores have highly nonnormal distributions. $$\begin{array} { c c c } \text { Student } & \text { Written exam score } & \text { Oral exam score } \\1 & 60 & 55 \\2 & 72 & 78 \\3 & 33 & 60 \\4 & 89 & 87 \\5 & 61 & 79 \\6 & 65 & 82 \\7 & 25 & 41 \\8 & 80 & 58 \\9 & 92 & 95 \\10 & 48 & 64 \\11 & 65 & 70\end{array}$$
The medical examination board wants to know if the oral exam scores are higher than the written exam scores.State the appropriate null hypothesis for this problem.

A) H₀: The probability distribution of written exam scores is identical to the probability distribution of oral exam scores.
B) H₀: The probability distribution of written exam scores is shifted to the left of the probability distribution of oral exam scores.
C) H₀: The probability distribution of written exam scores is shifted to the right of the probability distribution of oral exam scores.
D) H₀: The probability distribution of written exam scores is shifted to the left or right of the probability distribution of oral exam scores.