Presentation on theme: "What makes a good experiment?. Sampling Techniques 1.Indentify the target population Get a Random Sample – (everyone in the population has the same chance."— Presentation transcript:
Sampling Techniques 1.Indentify the target population Get a Random Sample – (everyone in the population has the same chance of being chosen).
Grouping your sample… Experimental (treatment) group Control Group Placebo Control Group – Placebo Effect Experimental group gets the IV Control group gets no IV Sometimes there is a Placebo group which gets a fake IV (Placebo) http://www.youtube.com/watch?v=yfRVCaA5o18
Types of Experiments Laboratory Experiments Maximizes control over the variables. Easier to show reliability and sometimes validity What is the weakness of a lab experiment? Artificial results Hawthorne or screw- you effect Observing the effects of a scary movie in a lab.
Types of Experiments Field Experiments Try to control the variables out in the real world. What are its strengths? Improves ecological validity What are its weaknesses? More confounding variables Observing the effects of a scary movie in the home.
Types of Experiments Quasi The IV occurs naturally and cannot be controlled. Like the introduction of the iphone and Samsung Android. Very little control over the variables. Like studying whether people that drink more pick certain fraternities. But at least its real.
How to read a research article: 1.Abstract 2.Literature Review 3.Methodology 4.Results 5.Discussion 6.Conclusion 7.Sources