Observed minus predicted.
Measures the outcome of a study.
May help explain or influence changes in a response variable.
Area of a density curve.
68, 95, 99.7
Rule for area of normal distributions.
A population divided into small groups ideally reflecting the characteristics of the population.
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Groups of the population with similar characteristics within each group.
Observes individuals but does not make an attempt to influence the responses.
Deliberately imposes some treatment on individuals to measure their responses.
A group of experimental units known to be different before the experiment in a way that will affect the responses to the treatment.
Matched pairs design
Blocks created by matching pairs of similar experimental units. One member of each pair gets each treatment.