We can design a matched pairs experiment when the data collected are: $\begin{array}{|l|l|}
\hline\text { A. } & \text { observational. } \
\hline \text { B. } & \text { experimental. } \
\hline \text { C. } & \text { controlled. } \
\hline \text { D. } & \text { All these choices are correct. } \
\hline
\end{array}$

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The Answer of We can design a matched pairs experiment when the data collected are: $\begin{array}{|l|l|}
\hline\text { A. } & \text { observational. } \
\hline \text { B. } & \text { experimental. } \
\hline \text { C. } & \text { controlled. } \
\hline \text { D. } & \text { All these choices are correct. } \
\hline
\end{array}$

We Can Design a Matched Pairs Experiment When the Data