Deck 18: Nonparametric Methods

Question 1

The level of measurement that is a label for the purpose of identifying an item is _____.

A) ordinal measurement
B) ratio measurement
C) nominal measurement
D) internal measurement

Answer 1

nominal measurement

Question 2

The level of measurement that allows for the rank ordering of data items is _____.

A) nominal measurement
B) ratio measurement
C) interval measurement
D) ordinal measurement

Answer 2

ordinal measurement

Question 3

Statistical methods that require assumptions about the population are known as _____.

A) distribution-free methods
B) nonparametric methods
C) either distribution-free or nonparametric methods
D) parametric methods

Answer 3

parametric methods

Question 4

Nonparametric methods that can be used to make inferences about a population without requiring an assumption about the distribution of the population are called _____.

A) continuity-correction methods
B) non-probabilistic methods
C) distribution-free methods
D) non-quantitative methods

Question 5

For the Wilcoxon signed-rank test, ties among absolute differences are assigned the _____.

A) lowest of their ranks
B) average of their ranks
C) highest of their ranks
D) sum of their ranks

Question 6

A nonparametric version of the parametric analysis of variance test is the _____.

A) Kruskal-Wallis test
B) Mann-Whitney-Wilcoxon test
C) sign test
D) Wilcoxon signed-rank test

Question 7

The Spearman rank-correlation coefficient is _____.

A) a correlation measure based on the average of data items
B) a correlation measure based on rank-ordered data for two variables
C) a correlation measure based on the median of data items
D) None of the answers is correct.

Question 8

If the assumption can be made that the populations all have the same shape, the Kruskal-Wallis test becomes _____.

A) a test of the skewness of the k populations
B) a test of the variances of the k populations
C) a test of the medians of the k populations
D) a test of the means of the k populations

Question 9

When ranking combined data in a Wilcoxon signed-rank test, the item that receives a rank of 1 is the _____.

A) lowest value
B) highest value
C) middle value
D) average of the highest and lowest values

Question 10

Statistical methods that generally require very few, if any, assumptions about the population distribution are known as _____.

A) parametric methods
B) nonparametric methods
C) free methods
D) None of the answers is correct.

Question 11

A nonparametric method for determining the differences between two populations based on two matched samples where only preference data are required is the _____.

A) Mann-Whitney-Wilcoxon test
B) Wilcoxon signed-rank test
C) sign test
D) Kruskal-Wallis test

Question 12

If a null hypothesis that states that two populations are identical is rejected using a nonparametric test, then it is safe to assume that _____.

A) neither the means nor the variances are equal
B) the means of the populations are not the same
C) the variances of the populations are not the same
D) We cannot be sure of the way in which the populations differ from each other.

Question 13

For the Wilcoxon signed-rank test, differences of 0 are _____.

A) discarded
B) assigned a rank of n/2
C) assigned a rank of n
D) assigned a rank of n + 1

Question 14

A nonparametric test for the equivalence of two populations would be used instead of a parametric test for the equivalence of the population parameters if _____.

A) the samples are very large
B) the samples are not independent
C) no information about the populations is available
D) The parametric test is always used in this situation.

Question 15

The labeling of parts as "defective" or "non-defective" is an example of _____.

A) ordinal data
B) ratio data
C) interval data
D) nominal data

Question 16

The Spearman rank-correlation coefficient for 20 pairs of data when Σd_i² = 50 is _____.

A) .0063
B) .0376
C) .9624
D) .9937

Question 17

A nonparametric test would be used if _____.

A) nominal data are available
B) interval data are available
C) it is known that the population is normally distributed
D) None of the answers is correct.

Question 18

Which of the following tests would not be an example of nonparametric method?

A) Mann-Whitney-Wilcoxon test
B) Wilcoxon signed-rank test
C) Sign test
D) t test