AP Statistics Midterm Study Guide

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Residual
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Observed minus predicted.
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Response variable
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Measures the outcome of a study.
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Explanatory variable
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May help explain or influence changes in a response variable.
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1
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Area of a density curve.
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68, 95, 99.7
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Rule for area of normal distributions.
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Cluster
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A population divided into small groups ideally reflecting the characteristics of the population.
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Strata
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Groups of the population with similar characteristics within each group.
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Observational study
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Observes individuals but does not make an attempt to influence the responses.
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Experiment
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Deliberately imposes some treatment on individuals to measure their responses.
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Block
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A group of experimental units known to be different before the experiment in a way that will affect the responses to the treatment.
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Matched pairs design
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Blocks created by matching pairs of similar experimental units. One member of each pair gets each treatment.

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