## Quick Reference

The probability, in a hypothesis test concerning the value of a parameter, of accepting the null hypothesis when the alternative hypothesis is, in fact, true. Also referred to as the probability of a Type II error. The value of *β* depends upon the true parameter value. The probability of rejecting the null hypothesis when the alternative hypothesis is true is the power of the test. Its value is 1−*β*.

**From:**
beta
in
A Dictionary of Statistics »

*Subjects:*
Probability and Statistics.

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