REC270 Lecture Notes - Systematic Sampling, Dependent And Independent Variables, Men...
5 Dec 2013
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Experiment group = dog; treatment = staged bookcase falling on owner; post-test. Bad experiment design, dog knew it was fake (smell) Involve manipulation or modification of a situation. Looking for presence or absence of the "cause" Measurement of dependent variable prior to treatment. Measurement of dependent variable after treatment is introduced. Two groups must be similar, comparable and created through random assignment. Increases confidence that the groups are not different in any systematic way. E. g. draw 30 people form a population, randomly assign 15 to experimental group and 15 to control group. Random sample taken from population then participants are assigned to groups on the basis of matching characteristics. E. g. sample of 30 from a population has 20 women and 10 men each group has the same sex ratio (2:1) Types of experimental designs: classical experimental designs. Experimental group -> pretest -> treatment -> post-test. Control group -> pretest -> post-test: pre-experimental design, one-shot case study design.
