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BESC 3010, Chapter 9 Questions & Answers
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BESC 3010, Chapter 9 Questions & Answers
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BESC 3010, Chapter 9 Questions &Answers
Cohen's d indicates the number of...
A. standard errors between two means
B. standard deviations between two means
C. matching observations in two samples
D. different observations in two samples Correct Ans-standard deviations between two
means. (Standard errors are the t-tests)
If a researcher wants to compare the effects of an antidepressant to the effects of a placebo on
levels of anxiety then what is the dependent variable (that is, the DV)?
A. medication: antidepressant vs. placebo
B. levels of anxiety
C. antidepressant medication
D. two-sample t-test Correct Ans-levels of anxiety; it's the outcome variable
If a researcher gathers data from participants before and after they participate in an exercise
training program and wants to know whether their performance scores improved, then he
should use Correct Ans-a one-tailed, repeated measures t-test. You're looking to see if scores
improved, and a two test is done to see if scores are different.
One-tailed test... if the scores are expected to go up.
If a research conducts an inferential test (such as a t-test) and retains (i.e., fails to reject) the null
hypothesis, then what is the probability of a Type I error.
A. 1.00
B .05
C. 1.00-p
, D. 0.00 Correct Ans-0.00
-Type I error =false type positive.
- Can only happen if positive result occurs (e.g., null is rejected)
One assumption of the two-sample t-test is that...
A. the two samples are independent of one another
B. the data have a uniform distribution
C. the two samples are as similar as possible
D. a two-tailed test will be used Correct Ans-the two samples are independent of one
another. If the two sample are not independent then you preform a repeated t-test.
Imagine that a researcher conducts a two-sample t-test with critical values of +-2.10 and gets an
observed value (or test value) of t=1.98. What is the proper conclusion in this case?
A. retain the null hypothesis
B Reject the null hypothesis
C. Cannot be determined without additional information
D. The research should use a z-test instead. Correct Ans-Retain the null hypothesis; because
we believe that the value is still within the acceptable range of variation of sample error.
If a researcher wants to compare the effects of an antidepressant to the effects of a placebo on
levels of anxiety, then what is the grouping variable?
A. medication: antidepressant vs. placebo
B. Levels of anxiety
C. antidepressant medication
D. two-sample t-test Correct Ans-medication: antidepressant vs. placebo; because it defines
the two groups we get the means from.
Levels of anxiety is the outcome/dependent variable. Antidepressant medication is only one of
the levels, and the two sample is the test we'd use.
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