The entire group of individuals that we want information about
What is a population?
100
A part of the population that we actually examine in order to gather information
What is a sample?
100
It occurs when an individual chosen for the sample can’t be contacted or does not cooperate
What is nonresponse?
200
It occurs when some groups in the population are left out of the process of choosing the sample
What is undercoverage?
200
A sample chosen by chance.
What is a probability sample?
200
Has the most important influence on the answers given to a sample survey.
What is the wording of questions?
200
Attempts to contact every individual in the entire population
What is a census?
200
Involves studying a part in order to gain information about the whole
What is sampling?
300
A long string of digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 with these two properties: 1) Each entry in the table is equally likely to be any of the 10 digits 0 through 9, 2) the entries are independent of each other.
What is a table of random digits?
300
Consists of people who choose themselves by responding to a general appeal; subject to bias because people with strong opinions, especially negative opinions, are most likely to respond
What is a voluntary response sample?
300
Respondents may lie when giving responses, especially if asked about illegal or unpopular behavior
What is response bias?
300
We observe individuals and measure variables of interest but do not attempt to influence the responses
What is an observational study?
300
We deliberately impose some treatment on individuals in order to observe their responses
What is an experiment?
400
Sample chosen by first dividing the population into groups of individuals called strata that are similar in some way that is important to the response .
What is a stratified random sample?
400
A sample that divides the population into groups or clusters. Some of the clusters are randomly selected. Then all individuals in the chosen clusters are selected to be in the sample.
What is cluster sampling?
400
A sample of size n consisting of n individuals from the population chosen in such a way that every set of n individuals has an equal chance to be the sample actually selected
What is a simple random sample?
400
The list of individuals from which a sample is actually selected