Experimental designs

1. Describe in detail, the logic of an outcome evaluation that makes use of a traditional two group, randomized experiment. Specifically, what does this evaluation design attempt to do in order to answer the central question of program effectiveness? In addition, describe each of the following threats to internal validity (selection bias, maturation and history effects) and discuss in specific detail how an experimental design can control for these potential threats.
The booked used is Evaluation A Systematic Approach by Peter Rossi/Mark Lipsey and Howard Freeman








preview of the answer..

A two-group is the simplest of all experimental designs. The design normally has two lines with each group having a single line. At the beginning of each line, there is an R, which indicates that the two groups are randomly assigned. One of the groups is a subject group while the other group is a control group. The idea here is that one of the groups gets a program while the other group does not. The changes in the subject group are then compared to that of the control group. The two-group design does not use a pretest. Experimental …

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