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Quizzes
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1
To conduct the sign test, we assume the following:
A)The population is normally distributed
B)The scale of measurement is interval.
C)The samples are dependent.
D)There are at least 20 observations in the sample.
2
The Wilcoxon rank-sum test and the Kruskal-Wallis test
A)Assume normal populations.
B)Assume independent samples.
C)Use the nominal scale of measurement.
D)Assume dependent samples.
3
The sign test and the Wilcoxon signed-rank test
A)Assume normal populations.
B)Assume independent samples.
C)Use the nominal scale of measurement.
D)Assume dependent samples.
4
The Wilcoxon signed-rank test makes use of the magnitude of the difference between paired observations but the
A)Sign test uses only the direction of the difference.
B)Kruskal-Wallis uses the sign of the difference.
C)Sign test uses the square of the difference.
D)Sign test uses the residuals.
5
The test statistic for the Kruskal-Wallis is a
A)z-statistic
B)t-statistic
C)χ2 statistic.
D)F statistic.
6
If the assumptions for the paired t test cannot be met, the nonparametric test that should be used is the
A)Wilcoxon signed-rank test.
B)Two-way ANOVA.
C)Wilcoxon rank-sum test.
D)Kruskal-Wallis test.
7
If the assumptions for the independent t test cannot be met, the nonparametric test used is the
A)Wilcoxon signed-rank test.
B)Sign test.
C)Wilcoxon rank-sum test.
D)Kruskal-Wallis test.
8
Which of the following statements is not correct regarding Spearman's coefficient of rank correlaton?
A)It can range from -1.00 to 1.00.
B)If the ranks of two samples are completely unrelated, its value is 0.
C)Its square root is called the coefficient of determination.
D)It is applicable to ordinal scale data.
9
Which of the following is not a nonparametric test?
A)The Wilcoxon signed-rank test.
B)The sign test.
C)The median test.
D)The one-way ANOVA.
10
If the null hypothesis is rejected in the Kruskal-Wallis test, we conclude that
A)There is no difference in the two groups.
B)The population distributions are statistically different.
C)The intervention was effective.
D)The probability of a Type I error is zero.





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