Identify the Threats with the Type of Validity They Threaten

Essay

Identify the threats with the type of validity they threaten
$$\begin{array} { | l | l | } \hline \text { 1. Pretest effects } & \text { a. Intermal validity } \\\hline \text { 2. History } & \text { b. Extermal validity } \\\hline \text { 3. Reactivity } & \\\hline \text { 4. Self-selection } & \\\hline \text { 5. Maturation } & \\\hline \text { 6. Irstrumentation } & \\\hline \text { 7. Experimenter bias } & \\\hline \text { 8.Multiple-treatrnentiriterference } & \\\hline \text { 9. Statistical repression } & \\\hline \text { 10. Experimental mortality } & \\\hline\end{array}$$