Question

If a test of hypothesis has a Type I error probability of .05, it means that if the null hypothesis is true, ____

(A) you don't reject it 5% of the time if the null hypothesis is true
(B) you reject if 5% of the time if the null hypothesis is false
(C) you don't reject it 5% of the time if the null hypothesis is false
(D) you reject it 5% of the time

Answer 1

Answer: (D) you reject it 5% of the time

Explanation:

• In hypothesis testing ,Type 1 error is the situation when the null hypothesis is true but we reject it.

Given : A test of hypothesis has a Type I error probability of 0.05

Which can be written as 5%.

It means that if null hypothesis is true, you reject it 5% of the time.