Exhibit 7-4: a Group of Researchers Has Developed a Method

Exhibit 7-4: A group of researchers has developed a method that they hypothesize will improve physics test scores.They randomly selected nine students to participate in their study.The nine students were administered an ACT test, trained in the new method, and then administered an alternate form of the ACT test.The following data are their scores:
$\begin{array}{lll}\text {Subject } & {\text {Test 1 }}{} & \text {Test 2 } \\ 1 & 20 & 19 \\ 2 & 20 & 20 \\ 3 & 24 & 21 \\ 4 & 24 & 24 \\ 5 & 24 & 22 \\ 6 & 17 & 15 \\ 7 & 18 & 15 \\ 8 & 18 & 16 \\ 9 & 20& 18\end{array}$
-Refer to Exhibit 7-4.What is the null hypothesis?

A) $\mu$ _{Test 1} $\geq$$\mu$ _{Test 2}
B) $\mu$ _{Test 1} $\leq$ $\mu$ _{Test 2}
C) $\mu$ _{Test 1} = $\mu$ _{Test 2}
D) None of these are true.