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Return to Research Methods Using R 1e Student Resources
Chapter 6 Multiple choice questions
Quiz Content
*
not completed
.
What is the effect size (
d
) for a t-test with t=4.41, with 24 participants in each of the two groups?
d
= 1.59
correct
incorrect
d
= 0.53
correct
incorrect
d
= 1.27
correct
incorrect
d
= 1.34
correct
incorrect
*
not completed
.
What is the effect size (
d
) for a correlation of 0.4 with 60 subjects?
d
= 4.39
correct
incorrect
d
= 0.87
correct
incorrect
d
= 80.86
correct
incorrect
d
= 7.96
correct
incorrect
*
not completed
.
What is the effect size (g) for an F-test with F=3.3, and 18 and 12 subjects in the two groups?
g
= 0.53
correct
incorrect
g
= 0.66
correct
incorrect
g
= 0.26
correct
incorrect
g
= 0.68
correct
incorrect
*
not completed
.
What is the odds ratio for a two-tailed t-test which produced a p-value of 0.032 having tested 15 subjects in each group?
OR = 4.46
correct
incorrect
OR = 1.49
correct
incorrect
OR = 0.82
correct
incorrect
OR = 79%
correct
incorrect
*
not completed
.
Which of the following is the largest effect size (Cohen's
d
)?
d
= 1
correct
incorrect
A correlation with r = 0.54 and 20 participants
correct
incorrect
A t-test with
t
= 2.2 and 12 participants per group
correct
incorrect
A chi-square test with
x
^{2}
= 0.77 for 87 participants
correct
incorrect
*
not completed
.
Create two variables as follows, that contain lists of effect sizes (d) and accompanying standard errors:
d <- c(0.82,1.14,0.11,3.4)
se <- c(0.11,0.84,0.15,2.2)
Run a random effects meta-analysis using these variables. What is the mean d?
d
= 0.11
correct
incorrect
d
= 0.94
correct
incorrect
d
= 0.32
correct
incorrect
d
= 0.61
correct
incorrect
*
not completed
.
What is the standard error of the mean effect size from question 6?
SE = 0.32
correct
incorrect
SE = 0.23
correct
incorrect
SE = 0.61
correct
incorrect
SE = 0.11
correct
incorrect
*
not completed
.
Run the analysis from questions 6 and 7 again, but as a fixed effects analysis. What are the mean effect size and standard error?
d
= 0.66, SE = 0.08
correct
incorrect
d
= 0.53, SE = 0.11
correct
incorrect
d
= 0.58, SE = 0.09
correct
incorrect
d
= 0.24, SE = 0.18
correct
incorrect
*
not completed
.
Conduct a random effects meta analysis based on the following data:
d
: 1.14, 2.38, 0.02, 0.64
SE: 0.12, 0.45, 0.01, 0.22
What is the mean effect size?
d
= 0.54
correct
incorrect
d
= 0.96
correct
incorrect
d
= 1.02
correct
incorrect
d
= 0.71
correct
incorrect
*
not completed
.
Repeat the analysis for question 9, but fixing the weights at 1. What is the standard error of the mean effect size?
SE = 0.41
correct
incorrect
SE = 1.04
correct
incorrect
SE = 0.58
correct
incorrect
SE = 0.42
correct
incorrect
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