A Psychiatrist Wishes to Determine Whether a New Medication Controls $\text { Number of Seizures }$

A psychiatrist wishes to determine whether a new medication controls seizures better than the patients' previous medications. The number of seizures is recorded on previous and new medications for a period of 1 year for each patient. The research question is focused on determining whether there are differences between the two means of the numbers of seizures between the previous and new medications. $\text { Number of Seizures }$
$\begin{array}{lll}&\text { Previous Medication }&\text { New Medication }\\\hline \text { Patient 1 } & 4 & 7 \\\text { Patient 2 } & 5 & 6 \\\text { Patient 3 } & 4 & 3 \\\text { Patient 4 } & 3 & 3 \\\text { Patient 5 } & 4 & 5\\\text { Patient 6 } & 3 & 2 \\\text { Patient 7 } & 4 & 5 \\\text { Patient 8 } & 6 & 7 \\\text { Patient 8 } & 4 & 4 \\\text { Patient 10 } & 3 & 2 \\\text { Patient 11 } & 4 & 5 \\\text { Patient 12 } & 5 & 4\\\hline \end{array}$
-Assume this t test had a nondirectional alternative hypothesis, and we will use the conventional level of statistical significance.The critical value (plus and minus) of the t test for this problem (obtained from Appendix B: t distribution) is

A) 2.179
B) 2.201
C) 3.106
D) 4.437