Section 1
1)
A research study produces a t statistic with df = 9. For this study, which of the following designs
would require a total of 20 participants?
(1pts)
Question 1 - A research study produces a t statistic with df = 9. For this study, which of the
following designs would require a total of 20 participants?
An independent-measures design
A repeated-measures design
A matched-subjects design
None of the other options would require a total of 30 participants.
2)
A researcher conducts a repeated-measures study to evaluate a treatment with a sample of n =
16 participants and obtains a t statistic of t = 2.141. The treatment is expected to increase
scores and the sample mean shows an increase. Which of the following is the correct decision
for a hypothesis test using alpha = .05?
(1pts)
Question 2 - A researcher conducts a repeated-measures study to evaluate a treatment with a
sample of n = 16 participants and obtains a t statistic of t = 2.141. The treatment is expected to
increase scores and the sample mean shows an increase. Which of the following is the correct
decision for a hypothesis test using alpha = .05?
Reject the null hypothesis with a one-tailed test but fail to reject with two tails
Reject the null hypothesis with either a one-tailed or a two-tailed test
Fail to reject the null hypothesis with either a one-tailed or a two-tailed test
Fail to reject the null hypothesis with a one-tailed test but reject with two tails
3)
A researcher obtains t(15) = 3.00 and Mean of Difference = 8 for a repeated-measures study. If
the researcher measures effect size using the percentage of variance accounted for, what value
will be obtained for r squared?
(1pts)
Question 3 - A researcher obtains t(15) = 3.00 and Mean of Difference = 8 for a repeated-
measures study. If the researcher measures effect size using the percentage of variance
accounted for, what value will be obtained for r squared?
9/24
, 9/29
4/13
4/24
4)
A researcher plans to conduct a research study comparing two treatment conditions with a
total of 30 participants. Which of the following designs would produce 30 scores in each
treatment?
(1pts)
Question 4 - A researcher plans to conduct a research study comparing two treatment
conditions with a total of 30 participants. Which of the following designs would produce 30
scores in each treatment?
An independent-measures design
A repeated-measures design
A matched-subjects design
All of the other options would produce 30 scores in each treatment.
5)
A researcher uses analysis of variance to test for mean differences among three treatments
with a sample of n = 12 in each treatment. The F-ratio for this analysis would have what df
values?
(1pts)
Question 5 - A researcher uses analysis of variance to test for mean differences among three
treatments with a sample of n = 12 in each treatment. The F-ratio for this analysis would have
what df values?
df = 2, 11
df = 2, 33
df = 2, 35
df = 2, 36
6)
An analysis of variances produces dftotal = 29 and dfwithin = 27. For this analysis, how many
treatment conditions are being compared?
(1pts)
Question 6 - An analysis of variances produces dftotal = 29 and dfwithin = 27. For this analysis,
how many treatment conditions are being compared?
1)
A research study produces a t statistic with df = 9. For this study, which of the following designs
would require a total of 20 participants?
(1pts)
Question 1 - A research study produces a t statistic with df = 9. For this study, which of the
following designs would require a total of 20 participants?
An independent-measures design
A repeated-measures design
A matched-subjects design
None of the other options would require a total of 30 participants.
2)
A researcher conducts a repeated-measures study to evaluate a treatment with a sample of n =
16 participants and obtains a t statistic of t = 2.141. The treatment is expected to increase
scores and the sample mean shows an increase. Which of the following is the correct decision
for a hypothesis test using alpha = .05?
(1pts)
Question 2 - A researcher conducts a repeated-measures study to evaluate a treatment with a
sample of n = 16 participants and obtains a t statistic of t = 2.141. The treatment is expected to
increase scores and the sample mean shows an increase. Which of the following is the correct
decision for a hypothesis test using alpha = .05?
Reject the null hypothesis with a one-tailed test but fail to reject with two tails
Reject the null hypothesis with either a one-tailed or a two-tailed test
Fail to reject the null hypothesis with either a one-tailed or a two-tailed test
Fail to reject the null hypothesis with a one-tailed test but reject with two tails
3)
A researcher obtains t(15) = 3.00 and Mean of Difference = 8 for a repeated-measures study. If
the researcher measures effect size using the percentage of variance accounted for, what value
will be obtained for r squared?
(1pts)
Question 3 - A researcher obtains t(15) = 3.00 and Mean of Difference = 8 for a repeated-
measures study. If the researcher measures effect size using the percentage of variance
accounted for, what value will be obtained for r squared?
9/24
, 9/29
4/13
4/24
4)
A researcher plans to conduct a research study comparing two treatment conditions with a
total of 30 participants. Which of the following designs would produce 30 scores in each
treatment?
(1pts)
Question 4 - A researcher plans to conduct a research study comparing two treatment
conditions with a total of 30 participants. Which of the following designs would produce 30
scores in each treatment?
An independent-measures design
A repeated-measures design
A matched-subjects design
All of the other options would produce 30 scores in each treatment.
5)
A researcher uses analysis of variance to test for mean differences among three treatments
with a sample of n = 12 in each treatment. The F-ratio for this analysis would have what df
values?
(1pts)
Question 5 - A researcher uses analysis of variance to test for mean differences among three
treatments with a sample of n = 12 in each treatment. The F-ratio for this analysis would have
what df values?
df = 2, 11
df = 2, 33
df = 2, 35
df = 2, 36
6)
An analysis of variances produces dftotal = 29 and dfwithin = 27. For this analysis, how many
treatment conditions are being compared?
(1pts)
Question 6 - An analysis of variances produces dftotal = 29 and dfwithin = 27. For this analysis,
how many treatment conditions are being compared?
