Comparing the output of strawberries grown on plots using fertilizer A with that grown on otherwise identical plots using fertilizer B, in order to make a general assessment of relative fertilizer effectiveness, may well call for a:
a. Friedman test
b. Kruskal-Wallis test
c. Wilcoxon rank-sum test
d. Spearman rank correlation test
e. chi-square test
Q. 2In a Wilcoxon rank sum test, the two sample sizes are 4 and 6, and the value of the Wilcoxon test statistic is T = 20 . If the test is a two-tailed and the level of significance is , then:
a. the null hypothesis will be rejected
b. the null hypothesis will not be rejected
c. the alternative hypothesis will not be rejected
d. the null hypothesis will be rejected and the alternative hypothesis will not be rejected
e. not enough information has been given to answer this question
Q. 3Statistical methods that require, among other assumptions, that the populations be normally distributed are known as:
a. distribution-free techniques
b. nonparametric techniques
c. parametric techniques
d. distribution-free techniques and nonparametric techniques
e. none of these
Q. 4Consider the following two independent samples: Sample A: 15 17 18 Sample B: 14 16 19 19 20 22 23 The value of the test statistic for a right-tailed Wilcoxon rank sum test is:
a. 3
b. 7
c. 11
d. 22
e. 31
Q. 5The nonparametric tests discussed in your book (Wilcoxon rank sum test, sign test, Wilcoxon signed rank test, Kruskal-Wallis test and Friedman test) all require that the probability distributions be:
a. identical except with respect to location
b. identical except with respect to spread (variance)
c. identical except with respect to shape (distribution)
d. different with respect to location, spread, and shape
e. different with respect to location
Q. 6Statistical methods that require few assumptions, if any, about the population distribution are known as:
a. parametric techniques
b. nonparametric techniques
c. free agent techniques
d. all of these
e. none of these
Q. 7Consider the following two independent samples: Sample A: 16 17 19 22 47 Sample B: 27 31 34 37 40 The value of the test statistic for a left-tailed Wilcoxon rank sum test is:
a. 6
b. 20
c. 35
d. 55
e. 70
Q. 8The Wilcoxon rank sum test statistic T is approximately normally distributed whenever the sample sizes are larger than or equal to:
a. 10
b. 15
c. 20
d. 25
e. 30
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