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BESC 3010 Final Exam Questions with correct Answers

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besc 3010 final exam
the two sample t test
medication antidepressant vs placebo
retain the null hypothesis
cohens d indicates the number of
one assumption of the two sample t test is that

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BESC 3010 Final Exam
What inferential test should be used to compare two sample means to each other? -
Answer- the two-sample t-test

The most important difference between Cohen's d and the t-test is that Cohen's d... -
Answer- is not affected by sample size

What is the formula for the degrees of freedom (df) for a two-sample t-test? -
Answer- n-2

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 independent variable (that is, the IV)? -
Answer- medication: antidepressant vs. placebo

when the means of two groups are the same, then Cohen's d.... - Answer- will equal
0

a two-sample t-test is an appropriate test when... - Answer- two samples are being
compared on an interval or ratio level variable

imagine that a researcher conducts a one-tailed (i.e., directional) two-sample t-test
with a critical value of -1.83 and gets an observed value (or test value) of t = +1.98.
What is the proper conclusion in this case? - Answer- retain the null hypothesis

Cohen's d indicates the number of... - Answer- standard deviations between two
means

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)? -
Answer- levels of anxiety

if a researcher gathers data from participates before and after they participate in an
exercise training program and wants to know whether their performance scores
improved, then he should use.... - Answer- a one-tailed, repeated measures t-test

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? - Answer-
0.00

one assumption of the two-sample t-test is that.... - Answer- the two samples are
independent of one another

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? - Answer- retain the null hypothesis

, 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? - Answer-
medication: antidepressant vs. placebo

the comparison group in a repeated measures t-test is... - Answer- each person's
own score at time 1

imagine that a researcher conducts a repeated measures t-test with critical values of
+-2.78 and gets an observed value (or test value) of t = -3.30. What is the proper
conclusion in this case? - Answer- reject the null hypothesis

when the means of two samples are being compared and Cohen's d = 0, then... -
Answer- the means are identical

if a researcher conducts an inferential test (such as a t-test) and rejects the null
hypothesis, then what is the probability of a type II error? - Answer- 0.00

if n = infinity, then what is the critical value of t for alpha = .05? - Answer- +-1.96

if a researcher conducts a t-test with an alpha of .01 and gets a p-value of .25, then
the researcher should... - Answer- retain the null hypothesis

if you want to compare the means of two different groups to each other then you
should use... - Answer- a two-sample t-test

what is the formula for the degrees of freedom (df) for a two-sample t-test? - Answer-
n-2

as the means of two groups become more similar, Cohen's d will... - Answer-
approach 0

if you conduct a one-time (i.e., directional) two-sample t-test with a critical value of +-
2.20 and gets an observed value of t = -3.53, then what should you do? - Answer-
retain the null hypothesis

if you conducted an experiment to compare the effects of two different online ad
campaigns on the number of clickthroughs, then what is the dependent variable
(DV)? - Answer- the number of clickthroughs

if you conduct an inferential test and retain the null hypothesis, then what is the
chance of a type I error? - Answer- 0.00

imagine that you conduct a two-sample t-test with critical values of +-2.30 and gets
an observed value (or test value) of t = -2.09. What should you do? - Answer- retain
the null hypothesis

the comparison group in a repeated-measures t-test is.... - Answer- each person's
own score at time 1

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