Which of the following are sources of variance?
The error
The variance
The treatment
All of the above
Why would you use post-hoc tests instead of planned contrasts?
We are interested in testing all possible comparisons
We are not interested in testing all possible comparisons
There is a need to improve the power of the test
There are not many comparisons to make
How can you improve the power of your experiment?
Increase the number of participants
Reducing the degrees of freedom for the residual source of variance
All of these
Increasing the number of levels of treatment
Examine the following table, how many follow-up comparisons would you have to make if you choose a post-hoc style of testing?
3
2
4
5
Examine the followng ANOVA SPSS output. If you ran post-hoc tests using Bonferroni correction, what level of alpha should you use per comparison?
0.005
0.05
0.01
0.001
In the following study, the researcher ran a series of post-hoc tests using LSD. What was the alpha-value per comparison?
0.30
0.15
The power of a test is the probability of...
Rejecting the null hypothesis when it is incorrect
Accepting the null hypothesis when correct
Accepting the alternative hypothesis when incorrect
Rejecting the alternative hypothesis when incorrect
Imagine you are a Clinical Neuropsychologist who works with language difficulties shown by aphasics resulting from a brain stroke. You are interested in studying the impact of a particular treatment as a function of the time interval between the time of the lesion and the time of the intervention. If you want to maximize the power of your study, which groups would you use?
Three groups: 1)Immediately after the stroke, 2) three weeks later, 3) six months later
Two groups: 1)Immediately after the stroke, 2) six months later
Two groups: 1) three weeks later, 2) six months later
Two groups: 1)Immediately after the stroke, 2) three weeks later
Examine the following graph, if you wanted to demonstrate the the 9th grade students gave higher food ratings than the older ones, which contrast coefficients would you use?
3 -2 -1 0
2 -1 -1 0
3 -1 -1 -1
2 1 0 -3
If you take steps to minimize Type 1 error, then the probability of making a Type 2 error is
Cut in half
Increased
Decreased
Unaffected
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