Question

You read a statistical test at a significance of a=0.05. What does this significance level indicate?

1) The probability of rejecting the null hypothesis when it is true
2) The probability of accepting the null hypothesis when it is false
3) The probability of making a Type I error
4) The probability of making a Type II error

Answer 1

The significance level of a statistical test, often denoted as alpha (α), represents the probability of making a Type I error.

Step-by-step explanation:

The significance level of a statistical test, often denoted as alpha (α), represents the probability of making a Type I error. A Type I error occurs when the null hypothesis is rejected even though it is true. In other words, it is the probability of falsely rejecting the null hypothesis. In this case, a significance level of a=0.05 means that there is a 5% chance of making a Type I error.