The level of significance; that is the probability that a statistical test will give a false positive error.
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A from z
Alpha is the probability that the test statistics would assume a value as or more extreme than the observed value of the test, BY PURE CHANCE, WHEN THE NULL HYPOTHESIS IS TRUE.
-2.58,2.58
Basically, if the original angle is alpha, the new value is: (alpha*PI)/180. For example, for 90 degrees you will get: (90*PI)/180 which is PI/2.
charactrestic of alpha