Question

(The setup for this question may be repeated on other questions.)

The long-term performance of a hypothesis test showed the following results.

• If the null hypothesis is true, the test will accept the null hypothesis 85% of the time and reject the null hypothesis 15% of the time.
• If the null hypothesis is false, the test will accept the null hypothesis 60% of the time and reject the null hypothesis 40% of the time.

The probability this test will commit a type I error is α= __________ .

Group of answer choices

.15

.60

None of the other choices represent a suitable response.

.85

.40

Answer 1

Type I error is rejection of true null hypothesis.

P(type I error) = P(reject the null hypothesis when null hypothesis is true) = 0.15

Option-A) 0.15