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Do unions have a positive or negative effect on economic efficiency?
Nondirectional Test
A hypothesis that does not predict the direction of the difference or association between variables, only that there is a difference.
One-Tailed Test
A statistical test that determines the probability of the observed data under the assumption that one end of the probability distribution is scrutinized.
Two-Tailed Test
A statistical hypothesis test in which the critical area of a distribution is two-sided and tests whether a sample is either greater than or less than a certain range of values.
Null Hypothesis
A statement suggesting that no statistical significance exists in a set of observations.
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