Effect size and mean difference scores question 20 5

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effect size and mean difference scores. Question 20 5 out of 5 points In an independent-samples t test, the _____ is used rather than the _____. Selected Answer: pooled variance; standard deviation Answers: standard deviation; pooled variance pooled variance; standard deviation standard deviation; variance variance; pooled variance Question 1 5 out of 5 points A study found statistically significant results for a hypothesis tested with an independent-samples t test. According to Cohen's convention, the author of the study reported her effect size for the test as medium. According to Cohen's convention, this convention is: Selected Answer: 0.5. Answers: 0.5. 0.2. 0.8. 0.3. Question 2 0 out of 5 points Squared standard deviation is equivalent to the: Selected Answer: standard error. Answers: standard error. variance. pooled variance. z test. Question 3 5 out of 5 points Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. They randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. The dependent variable in this study is: Selected Answer:
number of headaches. Answers: training type. number of headaches. control group. relaxation training. Question 4 5 out of 5 points A psychologist is interested in whether working memory is influenced by sleep loss. The psychologist administers a measure of working memory to two groups of subjects. The subjects in one group were kept awake for the entire night and the subjects in the other group maintained their normal sleep schedules. Which statistical analysis should be performed to answer the question “Does sleep loss affect working memory?” Selected Answer: independent-samples t test Answers: single-sample t test z test independent-samples t test paired-samples t test Question 5 5 out of 5 points The comparison distribution for an independent-samples t test is a distribution of: Selected Answer: differences between means. Answers: differences between means. means. mean difference scores. scores. Question 6 5 out of 5 points A p level of 0.05 corresponds to a confidence interval of _____%. Selected Answer: 95 Answers: 68 90 95 99.9 Question 7 0 out of 5 points There is(are) _____ degree(s) of freedom calculations for an independent samples t- test. Selected Answer:
1 Answers: zero 1 3 4 Question 8 5 out of 5 points In a(n) _____, a within-groups design with two groups, is used to compare the distribution of mean difference scores. Selected Answer: paired-samples t test Answers: single-sample t test z test independent-samples t test paired-samples t test Question 9 0 out of 5 points The first step in calculating a confidence interval for an independent-samples t test is to: Selected Answer: look up the t statistics for the lower and upper bounds.

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