Key Concepts- Part A
the entire universe of items from which a sample is drawn
What is the Population?
any group of people (or other objects) that is easily accessible to the researcher
What is Convenience Sample?
doing something in a completely unsystematic and unbiased manner
What is Random?
extent to which a research study's findings can be generalized to other people, places, situations, etc.
What is the External Validity?
sampling in which the goal is to obtain a sample (of people or objects) that represents some larger population
What is Representative or Random Sampling ?
the oversight committee charged with checking that research follows appropriate ethical procedures
What is the Institutional Review Board or (IRB) ?
percentage of people (or other units) that actually generate usable data for a study, relative to the total number that were sampled
What is Response Rate?
a sample not randomly selected from a population
What is a Nonrepresentative Sample?
natural difference between a sample and the population
What is the Sampling error?
a form of representative sampling in which larger units are randomly sampled, and then smaller units from within the larger units are sampled to provide the final sample
What is Multistage Sampling?
form of representative sampling in which the sample is drawn at random from a list of all the people (or other objects) in the population
What is Simple Random Sampling ?
Type of measurement that a person is unaware that he or she is being measured
What is Unobtrusive Measurement ?
populations that receive additional protection from university IRBs
Who are Vulnerable Populations ?