Alpha, often denoted as α, is the probability of making a Type I error, which occurs when the null hypothesis is incorrectly rejected when it is actually true. This is commonly set at a threshold such as 0.05 or 5%, indicating a 5% risk of concluding that a difference exists when there is no actual difference.

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What Is Alpha

Question 9

Multiple Choice

What is alpha?

A) A method of expressing differences between groups in a common metric
B) The probability of rejecting the null hypothesis when that hypothesis is true
C) The probability of rejecting the null hypothesis when it is false
D) The probability of accepting the null hypothesis when it is false

Correct Answer: