Lecture 6 Flashcards
What are surveys?
all respondents complete the same items. Used to obtain data about feelings and preferences and things :)
What is an important thing to remember when using surveys?
They are descriptive, not experimental/
Anscombe’s quartet is?
a cautionary demonstration
What is the most important thing when sampling?
Well, if it’s at Costco, go back for seconds. JK.
You need a representative sample for data to be generalizable to a population.
Define population
Set of all cases of interest
Define sampling frame?
specific list of subset of the population (the operation definition of the pop.)
Define sample?
the subset of the population drawn from the sampling frame that is included in the study.
Define element?
an individual member of a population.
A specific group within a population us under or over represented is known as a…?
selection bias
What is probability sampling?
a random sampling of the population, this is always preferred.
What is simple random sampling?
each element has the same probability of inclusion
What is stratified random sampling?
Population is divided into stratified subpopulations (like college students by grad class)
When a sample is not random, usually done out of convenience and is prone to bias is known as?
non-probability sampling (ex. call in shows)
What is response bias?
some people may be more likely to respond to surveys than others.
Name 4 common survey methods?
Mail, in-person, telephone, internet
