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A Wilcoxon rank sum test for comparing two populations involves two independent samples of sizes 15 and 20. If the value of un-standardized test statistic is T = 225, then the value of the standardized test statistic is z = -1.50.
Wilcoxon Rank Sum Test
A nonparametric statistical hypothesis test used for comparing two independent samples to assess whether their population mean ranks differ.
Un-standardized Test Statistic
An un-standardized test statistic measures the degree of deviation from the null hypothesis without adjusting for scale or variability in the data.
Standardized Test Statistic
A value calculated from sample data that is used to assess the viability of a null hypothesis in the context of a significance test.
- Understand the process for conducting a Wilcoxon rank sum test and deciphering the results.
- Acquire understanding of statistical decision-making and hypothesis testing across different levels of significance.
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Learning Objectives
- Understand the process for conducting a Wilcoxon rank sum test and deciphering the results.
- Acquire understanding of statistical decision-making and hypothesis testing across different levels of significance.
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