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Return to Research Methods Using R 1e Student Resources
Chapter 15 Multiple choice questions
Quiz Content
*
not completed
.
Assuming a starting alpha level of 0.05, what is the alpha level if we Bonferroni correct for 18 tests?
0.00278
correct
incorrect
0.9
correct
incorrect
0.0556
correct
incorrect
0.00056
correct
incorrect
*
not completed
.
What does a p-value of 0.026 change to after Bonferroni correction for 4 comparisons?
0.0065
correct
incorrect
0.026
correct
incorrect
0.104
correct
incorrect
0.0013
correct
incorrect
*
not completed
.
How many of the following p-values remain significant after applying Holm-Bonferroni correction (assuming alpha = 0.05)?
0.03, 0.01, 0.9, 0.6, 0.002, 0.045
One
correct
incorrect
Two
correct
incorrect
Three
correct
incorrect
None are significant
correct
incorrect
*
not completed
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Apply false discovery rate correction to the p-values from Question 3. How many remain significant?
One
correct
incorrect
Two
correct
incorrect
Three
correct
incorrect
None are significant
correct
incorrect
*
not completed
.
What is the familywise error rate for 8 comparisons with an alpha level of 0.01?
0.92
correct
incorrect
0.08
correct
incorrect
0.00125
correct
incorrect
0.077
correct
incorrect
*
not completed
.
Download the data file for the multiple-choice questions for Chapter 15
, and open it in
R.
The file contains a matrix called
timesignal
, which consists of data from 25 participants (rows) at 100 time points (columns). First conduct a t-test comparing to 0 at each time point. How many are significant?
10
correct
incorrect
31
correct
incorrect
37
correct
incorrect
49
correct
incorrect
*
not completed
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Use the code on pages 235-6 to find all of the contiguously significant clusters, assuming a cluster forming threshold alpha of 0.05. How many clusters are there (before cluster correction)?
3
correct
incorrect
10
correct
incorrect
17
correct
incorrect
29
correct
incorrect
*
not completed
.
What is the summed t-value of the largest cluster?
18.79
correct
incorrect
17.41
correct
incorrect
9.01
correct
incorrect
4.39
correct
incorrect
*
not completed
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Generate a null distribution based on resampling the largest cluster. Approximately, what are the upper and lower 95% confidence intervals of the distribution?
-2 to 2
correct
incorrect
-5 to 5
correct
incorrect
-10 to 10
correct
incorrect
-7 to 7
correct
incorrect
*
not completed
.
How many clusters remain significant following cluster correction?
1
correct
incorrect
3
correct
incorrect
7
correct
incorrect
9
correct
incorrect
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