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alpha
Probability of a Type I error.

alternative hypothesis
The investigator's working hypothesis (also called theĀ experimental hypothesis), which in null hypothesis significance testing (NHST) is in opposition to the null hypothesis (H_{0}).

beta
Probability of a Type II error.

null hypothesis
The hypothesis to be nullified; usually states that there is no relationship between two or more variables.

power
In significance testing, the probability of not making a Type II error.

p value
Probability value or level obtained in a test of significance.

Type I error
The error of rejecting the null hypothesis when it is true.

Type II error
The error of failing to reject the null hypothesis when it is false.

