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

Question

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

In the Pretest-Posttest Control Group Design Shown Above,selection Bias Is