Question

1.

The power of a statistical hypothesis test should be

Group of answer choices

small

large

equal to 1 - α

2.

If the Type II error rate of a statistical hypothesis test is 0.15,

Group of answer choices

the Type I error rate is 0.15

the Type I error rate is 0.85

the power is 0.15

the power is 0.85

3.

If sampled observations are from a normal distribution, the QQplot should look

Group of answer choices

bell-shaped

u-shaped

linear

4.

An important assumption for validity of a t-test is that

Group of answer choices

the population should have a normal distribution

the sample should have a normal distribution

the sample mean should have a normal distribution

Answer 1

1. The power of a statistical hypothesis test should be large.

Since the power lies between 0 and 1 and if it is close to 1 the test is very good at detecting a false null hypothesis.

2. If the Type II error rate of a statistical hypothesis test is 0.15, the power is 0.85

reason: power = 1- type 2 error

3. If sampled observations are from a normal distribution, the QQplot should look linear

4.

An important assumption for validity of a t-test is that the population should have a normal distribution