Half the Participants Were Given 15 Mg of the Drug $$\begin{array} { r r } 15 \mathrm { mg } & \text { Placebo } \\\hline 25 & 21 \\26 & 20 \\20 & 18 \\27 & 24\end{array}$$

Essay

Half the participants were given 15 mg of the drug and half received the placebo. Scores are reaction-time scores (.01 sec x 100). Perform a t test, find d, and interpret the results.Independent variable___________Dependent variable___________ $$\begin{array} { r r } 15 \mathrm { mg } & \text { Placebo } \\\hline 25 & 21 \\26 & 20 \\20 & 18 \\27 & 24\end{array}$$