PSY 301 Chapter Notes - Chapter 7: Multistage Sampling, Sampling Bias, Oversampling
Document Summary
Sampling: estimating the frequency of behaviors and beliefs. Population: entire set of people or products in which you are interested. Sample: smaller set, taken from that population. Census: studying every member of the population. Rarely done since it would take forever and is mostly excessive. Population of interest is more limited and specific. Coming from a population vs. generalizing to that population. Biased sample (unrepresentative sample): some members of population of interest have a much higher probability of being included than others. Unbiased sample (representative sample): all members of population have equal chance of being included. Convenience sampling: sampling only those who are easy to contact. Probability sampling (random sampling): every member of the population of interest has an equal chance of being selected. Regardless of whether they are convenient or motivated to volunteer. Nonprobability sampling: involve nonrandom sampling and result in a biased sample. Simple random sampling: assigning each person a number and then randomly picking a number.
