Which of the following probabilities is equal to the significance level α?

A) Probability of making a Type I error.
B) Probability of making a Type II error.
C) Probability of rejecting H₀ when you are supposed to.
D) Probability of not rejecting H₀ when you shouldn't.

Significance Level

The likelihood of incorrectly dismissing the null hypothesis in a statistical analysis, commonly represented by alpha, when it is in fact correct.

Type I Error

The mistake of rejecting the null hypothesis when it is actually true, commonly referred to as a "false positive" result.

Alpha (α)

A pre-specified significance level in hypothesis testing, representing the probability of making a Type I error, or falsely rejecting the null hypothesis.