1. You needn\'t be too concerned about violating the assumptions of the F test s
ID: 3218472 • Letter: 1
Question
1. You needn't be too concerned about violating the assumptions of the F test so long as (I know the answer is not A)
A) sample sizes are equal and very large
B) sample sizes are equal and larger than 10
C) sample variances are equal and very large
D) sample variances are equal and larger than 10
2. Use Cohen's d to estimate the effect size of (I know the answer is not A)
A) any difference between pairs of means
B) any significant difference between pairs of means
C) the largest difference between pairs of means
D) the mean difference between all pairs of means
3. Regardless of whether the null hypothesis is true or false, variability within groups reflects (I know the answer is not D)
A) only the treatment effect
B) only random error
C) random error and possibly the treatment effect
D) both random error and the treatment effect
4. Variability between groups is based on the variation among the scores of (I know the answer is not B)
A) equal numbers of subjects
B) randomly selected subjects
C) subjects treated differently
D) subjects treated similarly
5. If a treatment effect exists, (I know the answer is not B)
A) variability between groups will tend to exceed variability within groups
B) variability within groups will tend to exceed variability between groups
C) variability between groups and within groups will tend to be about the same
D) total variability will tend to exceed variability between groups and within groups
6. A treatment effect exists if differences exist between (I know the answer is not A)
A) all sample means
B) all population means
C) at least one pair of sample means
D) at least one pair of population means
Explanation / Answer
Answer 1:
Option B is correct.
You needn't be too concerned about violating the assumptions of the F test so long as sample variances are equal and very large
Answer 2:
Option D is correct.
Use Cohen's d to estimate the effect size of the mean difference between all pairs of means
Answer 3:
Option B is correct.
Regardless of whether the null hypothesis is true or false, variability within groups reflects only random error.
Answer 4:
Option A is correct.
Variability between groups is based on the variation among the scores of equal numbers of subjects.
Answer 5:
Option A is correct.
If there is a treatment effect, then the group means will differ more than you would expect by chance. So the variability between groups will be relatively high.
Answer 6:
Option D is correct.
A treatment effect exists if differences exist between at least one pair of population means.
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