SOC221H5 Lecture Notes - Lecture 8: Quota Sampling, Random Assignment, Grounded Theory
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Selection of participants in an experiment: ideally, participants would be randomly selected from a population. R o1 x o2 r - random assignment; o1 - pre-test observation. O1 o2 x - experimental treatment; o2 - post-test observation. Threats to internal validity in experimentation (can de eliminated through pre-test and randomisation) History: (e. g. an assassination of an ethnic-minority leader during an experiment. Maturation: individuals change over time, independently of iv (to lessen this. Testing: pre-test sensitisation or practice effect (people learn what your research. Selection bias: the experimental and the control groups are not similar. Experimental mortality: participants often drop out before the completion, even. 1. about effects of education on ethnic prejudice) 2. effect, add a control group that does not get special treatment that the experimental group gets) 3. topic is, and they learn to answer you in a socially acceptable manner)
