PSYC 202 Chapter Notes - Fall 2018 Chapter 3 - Direct manipulation interface, Cohort study, Statistical population
20 Sep 2018
School
Department
Course
Professor
Document Summary
A person that is moving is more likely to catch your eye than one standing still: sampling based on geographic location but not allowing all locations to be selected at random ex. How long people spend at a coffee shop but only monitor the drive-thru: selection is independent, one sampling unit cannot influence the probability that any other particular sampling unit is selected, all samples are possible, ex. Studying kingston- the composition of your sample must include sampling units from the east and west side. Observational study: a study using observations from a statistical population where the investigator has no control over the explanatory values: primary goal is to characterize something about an existing statistical population, ex. Classifying observational study designs: retrospective studies are ones where the outcome is already known, which comes with an increased risk for spurious relationships if you are selecting groups based on the outcome ex.
