What makes a good experiment Sampling Techniques 1

What makes a good experiment?

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=yf. RVCa. A 5 o 18

Types of Experiments Observing the effects of a scary movie in a lab. 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 screwyou effect

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. 2. 3. 4. 5. 6. 7. Abstract Literature Review Methodology Results Discussion Conclusion Sources