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PSY230 stats (exam 3 conceptual) NAU Dr. Weber Questions With Correct Solutions, Already Passed!!
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You conduct a z test using an alpha level of .05two-tail (zcrit = ± 1.96). The value of zobt = -1.5. Do you reject or retain the null hypothesis? - Retain the null hypothesis Mathematically, the power of an experiment is - the probability that the results of an experiment will allow rejection o...

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PSY230 stats (exam 3 conceptual) NAU
Dr. Weber
You conduct a z test using an alpha level of .05two-tail (zcrit = ± 1.96). The value of zobt = -1.5. Do you
reject or retain the null hypothesis? - Retain the null hypothesis



Mathematically, the power of an experiment is - the probability that the results of an experiment
will allow rejection of the null hypothesis if the independent variable has a real effect.



You conduct a sign test and find that the calculated probability is .067. You are using an alpha level of
.05two-tailed. Given this scenario, is the following statement true or false?



Based on the decision rule, you should reject the null hypothesis and conclude that the independent
variable has an effect on the dependent variable. - False



Is the following statement true or false?




A result that is statistically significant can be assumed to be important as well. - False



Which of the following asserts that the independent variable does not affect the dependent variable? -
The null hypothesis.



Match the type of test (one- vs. two-tailed) with the hypothesis for which it is indicated.



Question:

The new treatment will decrease depression scores.



The new treatment will have an effect on depression scores - B. One-tailed test

, A. Two-tailed test



The hypothesis that claims the difference in results between conditions is due to the independent
variable is the - alternative hypothesis



This error is defined as a decision to retain the null hypothesis when the null hypothesis is false. -
Type II error



By making alpha more stringent, the possible outcomes which allow the rejection of H0 are _______. -
decreased

As the power of an experiment increases, the probability of making a Type II error
___________________. - decreases



Holding other factors constant, increasing the size of the real effect will increase power. - True



Holding other factors constant, increasing the sample size (N) will increase power. - True



The higher the power, the more sensitive the experiment is to detect a real effect of the independent
variable. - True



Which of the following will increase power in the the z and t tests you've learned? - Correct

Increasing the size of the real effect



Correct

Decreasing sample variability



Correct

Increasing sample size



Correct

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