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O small test population has to give results that are

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Unformatted text preview: the variation • isolate the sensory response to factors of interest • minimize extraneous influences • control sample preparation and presentation • screen and train participants (sometimes) Accuracy • validity • ability of a test to obtain a true measure • predictive validity – do the test results predict what would occur in another situation? o small test population has to give results that are predictive of the larger population Sensitivity • a test cannot miss important differences that are present – it must detect these • minimize error variance • need enough measurements for statistical estimates • avoid false negatives • avoid type II error • minimize beta risk Avoid False Positives • finding a positive result when none is pr...
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