Consider the diagram below. Which experimental design is depicted?
$$\begin{array} { l l l }
\mathrm { R } & & \mathrm { O } _ { 1 } \
\mathrm { R } & \mathrm { X } & \mathrm { O } _ { 2 }
\end{array}$$
A) the posttest-only control-group design
B) the pretest-posttest control-group design
C) the Solomon four-group design
D) the interrupted time-series design

Question

Consider the diagram below. Which experimental design is depicted? 
$$\begin{array} { l l l } 
\mathrm { R } & & \mathrm { O } _ { 1 } \
\mathrm { R } & \mathrm { X } & \mathrm { O } _ { 2 }
\end{array}$$
A) the posttest-only control-group design
B) the pretest-posttest control-group design
C) the Solomon four-group design
D) the interrupted time-series design

Quizplus · Accepted Answer

This is the posttest-only control-group design, where one group receives the treatment (X) and both groups are measured afterward (O1 and O2).

Consider the Diagram Below RO1RXO2\begin{array} { l l l } \mathrm { R } & & \mathrm { O } _ { 1 } \\\mathrm { R } & \mathrm { X } & \mathrm { O } _ { 2 }\end{array}RR​X​O1​O2​​

Consider the Diagram Below $\begin{array} { l l l } \mathrm { R } & & \mathrm { O } _ { 1 } \\\mathrm { R } & \mathrm { X } & \mathrm { O } _ { 2 }\end{array}$