FMST 210 Chapter 14: Chapter 14 Sampling and generalization
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External validity = how well the results can generalize to other populations and setting. This is influenced by how you select you sample. For example, 8 out 10 pediatricians use johnson& johnson on their own children. It is important to ask hoe well does the sample represent the population. Need to use a representative sample to obtain external validity. a) b) All members of the population have an equal chance of being included. Convenience sample = uses only those who are readily available and volunteer to participate. Snowball sampling =asking participants from the study to suggest friends to sign up. Quota sampling =pick particular demographic categories and sample from them until a quota is reached. (or example, you get native english speaker in quebec and french speakers) Representativeness does not matter as much when studying association or causal claims. Self-selected people who participant in online polls of the fit of clothing. Families that allow researcher to videotapes their evening activities.
