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Exam 16: Nonparametric Tests

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Question 41

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The Friedman test compares medians when there are two grouping factors (rows,columns).

A) True
B) False

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Question 42

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Which nonparametric test is used to test for agreement in ranks of paired data?

A) Spearman test
B) Friedman test
C) Wilcoxon rank sum (Mann-Whitney) test
D) Kruskal-Wallis test

E) None of the above
F) A) and B)

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Question 43

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A clinic has four doctors.They wish to compare the amount of time that doctors spend with their patients.It is suspected that times may not be normally distributed but are otherwise assumed similar except in center,so a nonparametric test was chosen.The Kruskal-Wallis test results are shown below. Which is the best conclusion?

The Kruskal-Wallis test applies even if the c samples to be compared are not independent.

The Kruskal-Wallis test is equivalent to comparing medians in c groups.

The Mann-Whitney test is sometimes called the "Wilcoxon rank sum test" because it was formulated independently by different statisticians.

Which nonparametric test is analogous to a parametric two-sample t-test for means?

The Wilcoxon rank sum test (Mann-Whitney test)utilizes the ranks of two independent samples.

To compare the cost of three shipping methods,a firm shipped five orders to each of four different destinations over a six-month period.Their total shipping costs are shown below. Which nonparametric test would you use to compare the median shipping costs among destinations and among shippers?

Spearman's rank correlation is used to measure agreement in rankings of paired (x,y)data.

The Friedman test requires groups of equal size.

Which is not true of the one-sample runs test?

All of these are nonparametric tests except:

If the population is normal,we would still prefer a nonparametric test.

The Wilcoxon signed-rank test is analogous to a parametric t-test comparing three or more medians.

At the Food Barn,children can order from the adult menu (A) or the child's menu (C) .Below is the pattern of menu orders for 24 children last Wednesday evening. A,A,A,A,C,A,A,C,C,C,A,A,A,A,A,A,C,C,C,A,C,C,C,C Which statement is most accurate?

Nonparametric tests may require special tables for small samples.

Spearman's rank correlation is named for a British brewer who was testing beer samples.

If there are three or more populations with ordinal data,what is the appropriate test to determine whether the distributions are equal?

You do not wish to assume normality in the population,yet you wish to compare central tendency in c samples.You decide to utilize MegaStat,whose menu is shown here: Which menu would you choose?