Before employing inferential statistics, Alberto selects the probability level required for statistical significance. This level is referred to as the _____ of the test.

A) null hypothesis
B) research hypothesis
C) intuitive level
D) alpha level

Alpha Level

The probability of incorrectly rejecting the null hypothesis that is used by a researcher to decide whether an outcome of a study is statistically significant (most commonly, researchers use a probability of .05).

Statistical Significance

Rejection of the null hypothesis when an outcome has a low probability of occurrence (usually .05 or less) if, in fact, the null hypothesis is correct.

Probability Level

The threshold of significance, usually denoted as alpha (α), indicating the likelihood of observing the data if the null hypothesis is true.