What are the conditions for using a Kruskal-Wallis test?

Question

Accepted Answer

Hello there. Today we're gonna solve the following practice from together. So first off, let us read the problem and highlight all the key pieces of information that we need to use in order to solve this problem. A researcher wants to compare the median satisfaction scores on a ranked scale among 4 unrelated customer service teams. Which condition must be met to appropriately use the Cruzol Wallace test? Awesome. So it appears for this particular problem we're asked to determine which condition must be met to appropriately use the Cruzol Wallace test. So what condition has to be met in order to use this particular test appropriately. So with that in mind, let's read off our multiple choice answers to see what our final answer might be. A is each team's scores are paired with another team's scores. B is the satisfaction scores are measured on a nomial scale, C is the satisfaction scores are at least ordinal, and D is the scores within each team are dependent. Awesome. So with that in mind, our first step that we need to take in order to solve this this particular prompt, is we need to recall and note that the Krusel Wallace test requires the dependent variable to be at least ordinal. Secondly, we need to note and recall that the test does not require paired data. Groups must be independent. Thirdly, nommial data is not sufficient, ordinal or higher is required and needed. Fourthly, observations should be independent within and between groups. So our 5th and final step is we can therefore state that the correct answer, without a doubt has to be multiple choice answer letter C. Which is the satisfaction scores are at least ordinal, and that is our final answer. Hooray, we did it. So to quickly recap, so in order to solve this particular problem, you need to have an understanding of a Krusel Wallace test and what it entails, and then once you know all the details that make up this specific test, then solving a problem like this is very easy to do. Because we know that based on the information we discussed together, that the satisfaction scores are at least ordinal in order for it to be a condition that is needed to appropriately use this particular test. And that's it. We've officially solved this problem. Thank you so much for watching. Hopefully that helped, and I can't wait to see you in the next video. Bye.

What are the conditions for using a Kruskal-Wallis test?

Key Concepts

Kruskal-Wallis Test

Independence of Samples

Ordinal or Continuous Data

Watch next