Page 1
BESC 3010 Exam 3 Questions and
Correct Answers
Type I error (alpha)
Ans: False positive results
ex: reject the null hypothesis when you should accept it
Type II error (beta)
Ans: False negative results
ex: accept the null hypothesis when you should reject it
Which inferential test should be used to compare two
sample means to each other?
Ans: the two-sample t-test
,Page 2
the most important difference between cohen's d and the t-
test is that cohen's d
Ans: is not affected by sample size
what is the formula for the degrees of freedom (df) for a
two-sample t-test?
Ans: 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)?
Ans: medication: antidepressant vs. placebo
when the means of two groups are the same, then Cohen's
d...
,Page 3
Ans: will equal 0
A two sample t-test is an appropriate test when..
Ans: 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?
Ans: retain the null hypothesis
cohen's d indicates the number of...
Ans: standard deviations between two means.
, Page 4
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)?
Ans: Levels of anxiety
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...
Ans: 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?
Ans: 0.00
BESC 3010 Exam 3 Questions and
Correct Answers
Type I error (alpha)
Ans: False positive results
ex: reject the null hypothesis when you should accept it
Type II error (beta)
Ans: False negative results
ex: accept the null hypothesis when you should reject it
Which inferential test should be used to compare two
sample means to each other?
Ans: the two-sample t-test
,Page 2
the most important difference between cohen's d and the t-
test is that cohen's d
Ans: is not affected by sample size
what is the formula for the degrees of freedom (df) for a
two-sample t-test?
Ans: 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)?
Ans: medication: antidepressant vs. placebo
when the means of two groups are the same, then Cohen's
d...
,Page 3
Ans: will equal 0
A two sample t-test is an appropriate test when..
Ans: 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?
Ans: retain the null hypothesis
cohen's d indicates the number of...
Ans: standard deviations between two means.
, Page 4
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)?
Ans: Levels of anxiety
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...
Ans: 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?
Ans: 0.00
