Exam 16: Nonparametric Methods: Analysis of Ordinal Data

In the Kruskal-Wallis test, the degrees of freedom are:

The Wilcoxon rank-sum test includes a variable, W. It is the sum of the observed values from the larger sample.

The decision rule for a small sample sign test is based on a(n):

We can apply parametric tests, such as the t test, to ordinal or ranked level of measurement.

One difference between the Kruskal-Wallis method and one-way ANOVA is that the Kruskal-Wallace tests do not require the population ___________ to be the same.

For a given set of 12 ranked data values, the sum of the squared differences is 63.18. What is Spearman's coefficient of rank correlation for the data?

When the paired observations are equal in a Wilcoxon signed-rank test hypothesis:

For a given set of 12 ranked data values, the sum of the squared differences is 63.18. What is the test statistic value to test the hypothesis that the rank correlation coefficient is zero?

To apply the large-sample procedure for the sign test, the sample size should be at least _____.

A Spearman's rank-order correlation coefficient of 0.91 indicates a very weak relationship.

For a nonparametric test based on ranking the data, if a majority of the ranks are based on ties, what is the likely outcome of a hypothesis test? Why?

What is the test statistic for Spearman's rank correlation?

The Kruskal-Wallis H statistic follows the __________ distribution.

Using the following data, the Wilcoxon signed-rank hypothesis test is used to test the hypothesis that the test results of a treatment after training are greater than the test results before the treatment. What is the sum of the ranks?

The following are the ratings (0 to 4) given by 12 individuals for two possible new flavors of soft drinks. Wilcoxon rank-sum is to be used. What is W, if flavor #1 is identified as population 1?

A Spearman rank-order correlation coefficient of _____ indicates that there is no association between the two variables.

Twenty economists were sampled and asked to predict if the national economy would improve during the next 12 months. Eleven of the economists predicted an increase, two economists predicted no change, and seven economists predicted a decrease in the economy. Conduct a hypothesis test at the 0.10 significance level to determine if the majority of economists predict an increase. The correct analysis would be:

For the coefficient of rank correlation, what scale is used to measure the data?

The following are the ratings (0 to 4) given by 12 individuals for two possible new flavors of soft drinks. Wilcoxon rank-sum is to be used. What is the z test statistic?

We can apply non-parametric tests to problems involving interval or ratio data.