PSY 250 Lecture Notes - Lecture 13: Internal Validity, King Soopers, Course Credit
Document Summary
Goal: to apply results obtained from a sample to a population. We want our research to have broad implications. Generalizability ability to apply findings from a sample to the population. Probability sample probability of choosing an individual in the population is known. Ex: how many professional athletes are there in the u. s. , likelihood of picking one. Nonprobability/ sample probability of choosing an individual in the population is not known; not all members of the population are considered for participation. Ex: we don"t know the number of the population, or couldn"t get to all people. Random sampling randomly choose people from population to build. Random assignment experimental designs, randomly assign people to control or experimental group, or two different groups. Rates of depression in a sample could present and look differently than rates of depression for a whole population. Different types of sampling result in more or less sampling error. The people who don"t respond to a survey skew results.
