A Sample Design where, when the group is small, you are able to study each group member directly.
What is Census
100
When a large group of individuals are asked to respond, and those who choose to respond are included in the sample.
What is a Voluntary Response Sample.
100
When individuals may be influenced by the behavior of the interviewer or the types of questions being asked.
What is Response Bias.
100
When we want to observe individuals and record data without any intervention.
What is an observational Study.
100
A type of experimental design where subjects are first split into groups according to a common characteristic, then in each block, subjects are randomly assigned to treatment groups.
What is a block design.
200
The entire group of individuals we want information about.
What is the population.
200
When everyone has an equal chance of being selected from the population and each sample has an equal chance of being selected.
What is a Simple Random Sample (SRS)
200
When some individuals chosen cannot be contacted or refuse to cooperate.
What is Nonresponse.
200
The individuals on which the experiment is done.
What are experimental units.
200
An experiment where neither the subjects nor the people who have contact with them know which treatment a subject has received.
What is a double-blind experiment.
300
The part of the population in a study.
What is the sample.
300
When the first individual is chosen at random, then a system or rule is used to choose all other individuals.
What is a Systematic Random Sample.
300
When some part of the population has been left out of the process of choosing the sample.
What is Undercoverage.
300
The experimental condition we apply to the experimental units.
What is the treatment.
300
An experimental design where there are only two treatments. In each block, there is either: a single subject receiving both treatments or a pair of subjects each receiving a different treatment.
What is a matched pairs design.
400
The list of individuals who actually had a chance of being included in the sample.
What is the sampling frame.
400
When the population is divided into several groups and then one or more groups are selected and all individuals from those groups are in the sample.
What is A Cluster Sample.
400
Although random selection eliminates bias from our choice of sample, it does not guarantee that our sample is representative of the population. The goal is to have both ______&_________ to be low.
What is Bias and Variability.
400
These are avoided when designing experiments in order to assure that the results are not biased.
What are lurking variables.
400
This can arise in experiments when some other variables associated with a factor have an effect on the response variable. Unlike lurking variables this is associated in a non causal way with a factor and affects the response.
What is confounding variables.
500
This is the term used to describe when the sample does not accurately represent the population.
What is biased.
500
Divide the population into similar groups then select a random sample from each group and then combining them into a full sample.
What is a Stratified Random Sample.
500
What type of Sampling problem is this:
"How much sleep did you get last night?
A.) Less Than Average
B.) About Average
C.) More Than Average"
What is The Wording of Questions.
500
A dummy treatment, usually used on control groups, however, the subject or unit is unaware of its falsity.
What is a Placebo
500
An effect has this if it is too great to be caused simply by chance.