AP STATS types of experiments
Matched pair
A common form of blocking for comparing just two treatments.
Block
A group of experimental units known before the experiment to be similar in some way that is expected to affect response
Convenience sample
A sample selected by taking the members of the population that are easiest to reach
Explanatory Variable
A variable that helps explain or influences changes in the other variable
Lurking variable
A variable that is not among the explanatory or response in a study but that may influence the response variable.
Random sampling
A variable that measures an outcome of a study.
Response variable
A variable that measures an outcome of a study.
Cluster Sample
All individuals in the chosen group are included in the sample.
Single-blind
An experiment in which either the subjects or those who interact with them, but not both, know which treatment a subject received.
Double-blind
An experiment in which neither the subjects nor those who interact with them know which treatment a subject received.
Placebo effect
Describes the fact that some subjects respond favorably to any treatment, even an inactive one.
Stratified random sample
First classify the the population into groups of similar groups of individuals then choose a separate SRS from each group to form the full sample
Simple random sample (SRS)
Gives every possible sample of a given size the same chance to be chosen.
Observational study
Observes individuals and measures variables of interest but does not attempt to influence the responses.
Randomized Block Design
Random assignment of treatments is carried out separately within each block.
Bias
The design of a statistical study systematically favors certain outcomes.