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BESC 3010 Exam 3 Questions with
Detailed Verified Answers
Question: Type I error (alpha)
Answer: False positive results
ex: reject the null hypothesis when you should accept it
Question:
Type II error (beta)
Answer: False negative results
ex: accept the null hypothesis when you should reject it
Question:
Which inferential test should be used to compare two sample means to each
other?
Answer: the two-sample t-test
Question:
the most important difference between cohen's d and the t-test is that cohen's
d
Answer: is not affected by sample size
Question:
what is the formula for the degrees of freedom (df) for a two-sample t-test?
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Answer: n-2
Question:
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
Question:
when the means of two groups are the same, then Cohen's d...
Answer: will equal 0
Question:
A two sample t-test is an appropriate test when..
Answer: two samples are being compared on an interval or ratio level variable
Question:
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
Question:
cohen's d indicates the number of...
Answer: standard deviations between two means.
Question:
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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
Question:
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...
Answer: a one-tailed, repeated measures t-test.
Question:
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
Question:
one assumption of the two-sample t-test is that...
Answer: the two samples are independent of one another
Question:
imagine that a researcher conducts a two-sample t-test with a 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 (still in the range of variation for sampling
error)
BESC 3010 Exam 3 Questions with
Detailed Verified Answers
Question: Type I error (alpha)
Answer: False positive results
ex: reject the null hypothesis when you should accept it
Question:
Type II error (beta)
Answer: False negative results
ex: accept the null hypothesis when you should reject it
Question:
Which inferential test should be used to compare two sample means to each
other?
Answer: the two-sample t-test
Question:
the most important difference between cohen's d and the t-test is that cohen's
d
Answer: is not affected by sample size
Question:
what is the formula for the degrees of freedom (df) for a two-sample t-test?
, Page | 2
Answer: n-2
Question:
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
Question:
when the means of two groups are the same, then Cohen's d...
Answer: will equal 0
Question:
A two sample t-test is an appropriate test when..
Answer: two samples are being compared on an interval or ratio level variable
Question:
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
Question:
cohen's d indicates the number of...
Answer: standard deviations between two means.
Question:
, Page | 3
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
Question:
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...
Answer: a one-tailed, repeated measures t-test.
Question:
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
Question:
one assumption of the two-sample t-test is that...
Answer: the two samples are independent of one another
Question:
imagine that a researcher conducts a two-sample t-test with a 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 (still in the range of variation for sampling
error)
