STAT 130 Chapter Notes - Chapter 4-5: Confounding, Sampling Frame, Randomized Experiment
Document Summary
Subgroup of large population is questioned: randomized experiments. Manipulation assigned to participants on random bias. Experiment: measures effect of manipulating the environment in some way. Explanatory variable: differences between the two groups. Observational studies: manipulation occurs naturally, case-control study: include appropriate control group, meta- analysis: quantitative review of a collection of studies all done on a similar topic. Case study: in-depth examination of one or a small # of individual. Sampling frame: list of units from which a sample is chosen. Census: survey in which entire population is measured. Simple-random sampling: probability sampling plans: specified chance of making it into a population, simple random sample: same chance of being selected. Explanatory variables vs. response variables: explanatory variable. Differences in the groups: response variable. Treatment: one/ combination of categories of the explanatory variables assigned by the experimenter. Create differences in explanatory variables + examine the results: observational. Unethical/impossible to assign people to receive specific treatment.
