PSY 311 Lecture Notes - Lecture 1: Sampling Bias
10 Apr 2020
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Use participants who are easily available: very common, limits external validity. Everyone in the population does not have an equal chance of participating: may lead to a biased sample . Sample that is different than the population: because of selection biases. E. g. , recruiting over the phone favors people who have phones. Student populations: 81% of research participants are college students. Less variability in age, education, intelligence, wealth. Internet populations: increase in low paying, online research (e. g. , mturk, tend to. Voluntary participation: participation must be voluntary, but this can be bias a sample. Biased samples can threaten external validity i. e. , results may not generalize to others not in the sample. E. g. , age, sex, gender, ethnicity, education, sex, species, etc . Most early psych researcher was done on white men. Some findings may be universal, but others might not be. Need to consider if subject characteristics might affect results.
