If the probability that you will correctly reject a false null hypothesis

If the probability that you will correctly reject a false null hypothesis
is 0.80 at 0.10 significance level, α is__ and power is__.

0.10, 0.20
0.10, 0.80
0.90, 0.20
0.99, 0.80

If the significance level changes from 0.05 to 0.01, the power will___

Increase
Decrease
Stay the same
First increase, then decrease

Which of the following descriptions are correct?

Increasing sample size from 5 to 25 will increase power to a greater degree than increasing sample size from 15 to 35.
Increasing sample size from 60 to 80 will increase power to the same degree as increasing sample size from 200 to 220.
Increasing sample size from 40 to 60 will decrease power to a greater degree than increasing sample size from 60 to 80.
Increasing sample size from 50 to 70 will decrease power to the same degree as increasing sample size from 70 to 90.

Which of the following descriptions are correct regarding power (select all that apply)?

Changing from a one-tailed test to a two-tailed test can increase power
Increasing sample size can increase power
Increasing standard deviation will decrease power
Changing from a one-tailed test to a two-tailed test, or changing from a two-tailed test to a one-tailed test will not change power

Which of the following are correct (select all that apply)?

Researchers need to be aware that there is a tradeoff between significance level and power
Researchers can increase power of experiments by increasing sample size
Researchers can increase power of experiments by increasing significance level
Researchers need to know that the larger the effect size, the more likely that an experiment would find a significant effect

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