Research Methodology Lecture No :19 (Experimental Design-Cont)

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Presentation transcript:

Research Methodology Lecture No :19 (Experimental Design-Cont)

Recap Causal vs Correlation Field Study vs Field Experiment Control and Treatment Confounding variables –controllable un controllable Factors effecting Internal Validity –(History, Maturation, Testing effect, Instrument,selection Biases, Mortality..)

Objective Factors effecting External Validity When Experimental Design is necessary Different types of experimental Designs

When to Conduct Experimental Design

Control Group Experimental Group Expose (Treatment) Pretest score (Instrument) Post Test Score (Instrument) Difference

Pretest and Posttest (Problem Instrument Effect)

Posttest (Problem, Matching,Mortality Effect)

Pretest and Posttest Experimental and Control Group Randomized hence no effect of history, maturation, testing, instrument (Problem of Mortaility)

Different internal validity issues are taken care of such as Pretest and posttest of Group 2 allows to take care of history, maturation, instrumentation, regression. Group 3 remove the testing effect

Recap When to use experimental designs Pretest and Posttest Experimental Group Design Posttests only with Experimental and Control Group Pretest and Posttest Experimental and Control Group Design Solomon Four Group Design

When to have lab experiments and field experiments Issues of internal validity Issues of external validity Certain experimental design counter the effects of internal validity

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