BESC 3010 Final Exam Questions and
Answers
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
Answers
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
