Describe the following evaluation research designs
(a) One group Pre-and Posttest;
(b) Nonequivalent Comparison Group;
(c) Time Series; and
(d) Randomized Pre-and Posttest with a Control Group (Classical Experimental Design).
In your discussion include the major threats to internal and external validity (Name, Define, Provide an Example, State whether the design controls for the threat and Provide an explanation. In case the design does not control for the threat please provide alternative methods to minimize the effect of the threat)
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