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Quelques exemples de cette série de questions pratiques
1.
Which of the following is the correct description for a research study comparing problem-solving scores obtained for 3 different age groups of children? A. Single-factor design B. Two-factor design C. Three-factor design D. Factorial Design
Réponse: A. Single Factor Design
2.
ANOVA is necessary to evaluate mean differences among three or more treatments, in order to... A. minimize risk of Type 1 error B. maximize risk of Type 1 error C. minimime risk of Type 2 error D. maximize risk of Type 2 error
Réponse: A. minimize risk of Type 1 error
3.
The numerator of the F-ratio measures the size of the sample mean differences. How is this number obtained, especially when there are more than two sample means? A. by computing the sum of the sample mean differences B. by computing the average of the sample mean differences C. by the largest of the sample mean differences D. by computing the variance for the sample means
Réponse: D. by computing the variance for the sample means
4.
In an analysis of variance, the primary effect of large mean differences from one sample to another is to increase the value for... A. the variance between treatments B. the variance within treatments C. the total variance D. large mean differences will not directly affect any of the three variances
Réponse: A. the variance between treatments
5.
When the null hypothesis is true for an ANOVA, what is the expected value for the F-ratio? A. 0 B. 1.00 C. much greater than 1.00 D. less than zero
Réponse: B. 1.00
6.
An analysis of variance produces SSbetween treatments = 40 and MSbetween treatments = 10. In this analysis, how many treatment conditions are being compared? A. 4 B. 5 C. 30 D. 50
Réponse: B. 5
7.
An analysis of variance is used to evaluate the mean differences for a research study comparing four treatment conditions with a separate sample of n = 5 in each treatment. The analysis produces SSwithin treatments = 32, SSbetween treatments = 40, and SStotal = 72. For this analysis, what is MSwithin treatments? A. 32/5 B. 32/4 C. 32/16 D. 32/20
Réponse: C. 32/16
8.
In analysis of variance, a MS value is a measure of... A. variance B. average differences among means C. the total variability for the set of N scores D. the overall mean for the set of N scores
Réponse: A. variance
9.
A researcher reports an F-ratio with df = 3, 36 for an independent-measures experiment. How many treatment conditions were compared in this experiment? A. 3 B. 4 C. 36 D. 39
Réponse: B. 4
10.
Under what circumstances are posttest necessary? A. reject the null hypothesis with k = 2 treatments B. reject the null hypothesis with k > 2 treatments C. fail to reject the null hypothesis with k = 2 treatments D. fail to reject the null hypothesis with k > 2 treatments
Réponse: B. reject the null hypothesis with k > 2 treatments
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