Match the Term to Its Definition by Filling in the Letter

Match the term to its definition by filling in the letter before the term in the appropriate blank.
$$\begin{array} { | l | l | l | } \hline \text { A Experiment } & \text { I. Laboratory experiments } & \text { Q. In-depth interviews } \\\hline \text { B. Indices } & \text { J. Natural or field experiments } & \text { R. Experimental proup } \\\hline \text { C. Operationalize } & \text { K. Control eroup } & \text { S. Ordinal variables } \\\hline \text { D. Posttest } & \text { L. Population } & \text { T. Focus proups } \\\hline \text { E. Field research } & \text { M. Ethropraphy } & \text { U. Corverience sarnple } \\\hline \text { F. Participart observation } & \text { N. Interval variables } & \text { V. Reliability } \\\hline \text { G. Independent variable } & \text { O. Internal Review Boards } & \text { W. Validity } \\\hline \text { H. Dependent variable } & \text { P. Hypotheses } & \\\hline\end{array}$$
-____ A form of qualitative research in which a researcher becomes a member of the group being studied.