Question 1

Nonparametric tests are associated with less power to detect an effect when the data are skewed in the population.

Accepted Answer

A) True 
 B)False

Question 2

The Friedman test compares differences in the sum of ranks in two or more ________ groups.

Accepted Answer

A) independent 
B) related 
C) significant 
D) mature

Question 3

For a two-sample sign test,count the number of positive and negative difference scores.The larger number is the test statistic.

Accepted Answer

A) True 
 B)False

Question 4

Tests for ordinal data can ________ the power to detect an effect when data are skewed.

Accepted Answer

A) decrease 
B) increase 
C) have no effect on 
D) categorize

Question 5

Which of the following dispersions of scores for three groups (A,B,and C)best illustrates the null hypothesis for a Kruskal-Wallis H test?

Accepted Answer

A) The number of scores above and below the median are equal. 
B) The mean differences between two groups are equal. 
C) The sum of ranks in each group does not differ between groups. 
D) The ranks in two groups are equal to 0.

Question 6

The Mann-Whitney U test is used as a nonparametric alternative to which parametric test?

Accepted Answer

A) one-sample t-test 
B) two-independent sample t-test 
C) related samples t-test 
D) both A and C

Question 7

Which of the following scales of measurement are analyzed using a nonparametric test?

Accepted Answer

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

Question 8

Tests for ordinal data

Accepted Answer

A) are nonparametric tests 
B) do not measure variance to test for significance 
C) minimize problems associated with having outliers in a data set 
D) all of the above

Question 9

A professor ranks the grades of students in each of three sections of a statistics course.He computes H = 6.83 for the Kruskal-Wallis H test to test for differences between the sections.What is the decision for this test?

Accepted Answer

A) Retain the null hypothesis. 
B) Reject the null hypothesis. 
C) There is not enough information to answer this question.

Question 10

A researcher computes the Wilcoxon signed-ranks T test.She finds that the sum of positive ranks is 56 and the sum of negative ranks is 22.What is the value of the test statistic,T?

Accepted Answer

A) 22 
B) 34 
C) 56 
D) 78

Question 11

The sign test can be used as an alternative to the one-sample t-test and the two-independent sample t-test.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following dispersions of scores for two groups,A and B,best illustrates the null hypothesis for a Mann-Whitney U test?

Accepted Answer

A) A,B,A,B,A,B,A,B 
B) A,A,B,B,A,B,B,A 
C) B,A,B,A,A,B,A,B 
D) A,A,A,A,B,B,B,B

Question 13

A researcher computes Wilcoxon T = 12 and finds that this value is larger than the critical value.The decision is to reject the null hypothesis.

Accepted Answer

A) True 
 B)False

Question 14

The test statistic for the Friedman test is largest when

Accepted Answer

A) the ranks for each participant are consistent across groups 
B) the mean difference between groups is largest 
C) the ranks for each participant are not consistent across groups 
D) the value of the test statistic is less than or equal to .05

Question 15

A researcher computes a one-sample sign test in which the number of pluses is 8,the number of minuses is 2,and the number of scores equal to the median is 1.The test statistic (x)for the sign test is equal to

Accepted Answer

A) 1 
B) 2 
C) 8 
D) There is not enough information to answer this question.

Question 16

When the null hypothesis is true and n is greater than or equal to 5 per group,the test statistic for the Friedman test is associated with ________ degrees of freedom.

Accepted Answer

A) no 
B) n ñ 1 
C) k ñ 1 
D) .05

Question 17

A researcher computes  = 17 and  = 38.What is the value of the test statistic for a Mann-Whitney U test?

Accepted Answer

A) 17 
B) 38 
C) There is not enough information to answer this question.

Question 18

The null hypothesis for the Friedman test is that the sum of ranks in each group does not differ between groups.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following is not a step to average tied ranks?

Accepted Answer

A) Compute the mean of the tied ranks. 
B) Assume the ranks are in order. 
C) Rank each score by its effect size. 
D) Shift the remaining ranks accordingly.

Question 20

We compare the test statistic of a Kruskal-Wallis H test to the critical value given in the table for which hypothesis test?

Accepted Answer

A) the analysis of variance 
B) the t-test 
C) the chi-square test 
D) the Pearson correlation

Exam 18: Nonparametric Tests: Tests for Ordinal Data

Nonparametric tests are associated with less power to detect an effect when the data are skewed in the population.

The Friedman test compares differences in the sum of ranks in two or more ________ groups.

For a two-sample sign test,count the number of positive and negative difference scores.The larger number is the test statistic.

Tests for ordinal data can ________ the power to detect an effect when data are skewed.

Which of the following dispersions of scores for three groups (A,B,and C) best illustrates the null hypothesis for a Kruskal-Wallis H test?

The Mann-Whitney U test is used as a nonparametric alternative to which parametric test?

Which of the following scales of measurement are analyzed using a nonparametric test?

Tests for ordinal data

A professor ranks the grades of students in each of three sections of a statistics course.He computes H = 6.83 for the Kruskal-Wallis H test to test for differences between the sections.What is the decision for this test?

A researcher computes the Wilcoxon signed-ranks T test.She finds that the sum of positive ranks is 56 and the sum of negative ranks is 22.What is the value of the test statistic,T?

The sign test can be used as an alternative to the one-sample t-test and the two-independent sample t-test.

Which of the following dispersions of scores for two groups,A and B,best illustrates the null hypothesis for a Mann-Whitney U test?

A researcher computes Wilcoxon T = 12 and finds that this value is larger than the critical value.The decision is to reject the null hypothesis.

The test statistic for the Friedman test is largest when

A researcher computes a one-sample sign test in which the number of pluses is 8,the number of minuses is 2,and the number of scores equal to the median is 1.The test statistic (x) for the sign test is equal to

When the null hypothesis is true and n is greater than or equal to 5 per group,the test statistic for the Friedman test is associated with ________ degrees of freedom.

A researcher computes = 17 and = 38.What is the value of the test statistic for a Mann-Whitney U test?

The null hypothesis for the Friedman test is that the sum of ranks in each group does not differ between groups.

Which of the following is not a step to average tied ranks?

We compare the test statistic of a Kruskal-Wallis H test to the critical value given in the table for which hypothesis test?