$\begin{array} { l l l l l }
\mathrm { EG } : & \mathrm { R } & \mathrm { O } _ { 1 } & \mathrm { X } & \mathrm { O } _ { 2 } \
\mathrm { CG } : & \mathrm { R } & \mathrm { O } _ { 3 } & & \mathrm { O } _ { 4 }
\end{array}$ In the pretest- posttest control group design shown above, selection bias is eliminated by _ .
A) randomization
B) matching
C) statistical control
D) design control

Question

$\begin{array} { l l l l l } 
\mathrm { EG } : & \mathrm { R } & \mathrm { O } _ { 1 } & \mathrm { X } & \mathrm { O } _ { 2 } \
\mathrm { CG } : & \mathrm { R } & \mathrm { O } _ { 3 } & & \mathrm { O } _ { 4 }
\end{array}$ In the pretest- posttest control group design shown above, selection bias is eliminated by _ .
A) randomization
B) matching
C) statistical control
D) design control

Quizplus · Accepted Answer

Randomization eliminates selection bias by randomly assigning participants to the experimental and control groups, ensuring that the groups are equivalent in terms of relevant characteristics.

In the Pretest- Posttest Control Group Design Shown Above, Selection