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Glossary Term
A measure of the range of values in a set of numbers. Standard deviation is a statistic used as a measure of the dispersion or variation in a distribution, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean.
Glossary Term
A measure of the likelihood that a significance test will detect an effect or difference in a sample if the effect or difference exists in the entire population from which that sample was taken.
Glossary Term
A test used to determine the statistical significance of an observation.
Glossary Term
A statistical hypothesis test that controls directional errors if rejection of a hypothesis is the result of a directional decision. The two-sided test has less statistical power than the one-sided test.
