PSYCH 303 Chapter Notes - Chapter 7: Sampling Bias, External Validity, Internal Validity

• School: U of M
• Department: Psychology
• Course: PSYCH 303
• Professor: Colleen Seifert

Document Summary

Psychology 303 chapter 7: sampling- estimating the frequency of behaviors and beliefs. Learning objectives: explain why external validity often matters for a frequency claim, describe which sampling techniques allow generalizing from a sample to a population of interest and which ones" do not. In a biased sample (or unrepresentative sample) some members of the population of the interest have a much higher probability of being included in the sample compared to the other members. In a representative sample, all members of the population have an equal chance of being included in the sample: only these samples allow us to make inferences about the, when is a sample biased? population of interest. In cluster sampling, cluster of participants within a population are randomly selected and then all individuals in each cluster are used. In multistage sampling, two random samples are selected: random sample of clusters, random sample of people within those clusters, easier than sampling everyone, still representative i. e. )