A Psychiatrist Is Interested in the Effects of a New

Multiple Choice

A psychiatrist is interested in the effects of a new drug for the control of depression. In a clinical trial, 18 depressed patients were randomly assigned to one of two groups, either the drug group or the placebo group. One half hour after the administration of the drug or placebo, their depression was measured by the Coolidge Axis II Inventory's Depression scale and reported as T scores (M = 50, SD = 10) . $\begin{array} { c c } \hline \text { Drug } & \text { Placebo } \\\hline 52 & 65 \\53 & 59 \\58 & 68 \\50 & 53 \\53 & 59 \\58 & 67 \\55 & 61 \\66 & 70 \\53 & 62 \\\hline\end{array}$
-The value of the numerator in the t formula for this problem (either or -) is

A) 3.058
B) 55.33
C) 62.67
D) 7.33