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GCU PSY362HN Exam 2
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Terms in this set (17)
Which of the following is not one of the four steps to hypothesis testing?
evaluate the plan
The one-sample z test is a hypothesis test used to test hypotheses
concerning a single population with a known variance
Based on the effect size conventions, d = 0.60 is a
medium effect size
A researcher reports that the standard deviation in Population A is
𝜎 = 2.3 and the standard deviation in Population B is 𝜎 = 4.3. Which population is associated with the highest power to detect an effect?
State the critical value(s) for a t test using a 0.05 level of significance in the lower tail only: t(24).
A researcher reports a significant effect in some population. If he computes both an eta-squared and an omega-squared effect size estimate, then which estimate will be the largest?
To compute a two-independent sample t test, a researcher has to know many values. Which of the following is NOT a value that the researcher must know to compute this test?
the pooled population variance
A professor teaches a certain section of material using a lot of examples with sports and cars to illustrate. He is concerned that this may have biased his instruction to favor male students. To test this, he measures exam grades from this section of material among women (n = 10) and men (n = 10). The mean score in the male group was 84 ± 4.0 (M ± SD); in the female group, it was 78 ± 8.0 (M ± SD) points. If the null hypothesis is that there is no difference in exam scores, then test the null hypothesis at a 0.05 level of significance.
Exam scores were significantly higher in the male group, t(18) = 2.12, p < 0.05.
The ________ is an inferential statistic used to determine the number of standard deviations in a t distribution that a sample mean deviates from the mean value or mean difference stated in the null hypothesis.
One difference between a repeated measures design and a matched samples design is that
only one design involves observing the same participants in each group
A researcher matched 30 participants on intelligence (hence 15 pairs of participants), and then compared differences in emotional responsiveness to two experimental stimuli between each pair. For this test, what are the critical values, assuming a two-tailed test at a 0.05 level of significance?
To increase the value of estimated Cohen's d, a researcher increases the sample size. Will this change the value of d?
No; the sample size is not used to compute effect size.
The mean crying time of infants during naptime at a local preschool is 12 minutes. The school implements a new naptime routine in a sample of 25 infants and records an average crying time of 8 ± 4.6 (M ± SD) minutes. Test whether this new naptime routine reduced crying time at a 0.05 level of significance.
The new naptime routine significantly reduced crying time, t(24) = −4.35, p < 0.05.
Given the following values: 𝜇 = 59, M = 64, n = 42, 𝜎M = 3.5, 𝛼 = 0.05,
conduct a one-sample z test for a two-tailed non-directional critical hypothesis test. What will be the decision for the null hypothesis?
Do not reject the null hypothesis; therefore, one of the other choices are correct
For the related samples t test, assuming that all other values remain constant, then as samples size increases,
ALL OF THE ABOVE (the value of the test statistic increases, the power to detect an effect increases, the estimate for standard error decreases)
A researcher sampled 16 couples and measured the mean difference in their marital satisfaction. Each couple was paired and the differences in their ratings (on a 7-point scale) were taken. If the mean difference in satisfaction ratings for this sample was
1.8 ± 2.0 (MD ± SD), then what is the decision at a 0.05 level of significance?
Satisfaction ratings significantly differ, t(15) = 3.60.
I got 15/16 correct. I got #14 wrong by putting "Reject the null hypothesis" on "Given the following values: 𝜇 = 59, M = 64, n = 42, 𝜎M = 3.5, 𝛼 = 0.05, conduct a one-sample z test for a two-tailed non-directional critical hypothesis test. What will be the decision for the null hypothesis?"
Recommended textbook explanations
Statistical Techniques in Business and Economics
Douglas A. Lind, Samuel A. Wathen, William G. Marchal
A First Course in Probability
A First Course in Probability
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