STAT 1100 Chapter Notes - Chapter 17: Test Statistic, Analysis Of Variance, Thai Baht
Document Summary
In this chapter we introduce a few techniques that will al- low you to manage scenarios where the usual assumptions of independence or data measurement level are not satis- For all those situations, we present a nonparametric statis- tical approach that will allow you to meet speci c inferen- tial needs. You will reject the null hypothesis if z < z . This test makes no assumption about the shape of the pop- ulation distribution and it can be applied to ordinal data. The wilcoxon test is used to study population medians instead of means . The idea behind the test is the following: the population median should sit right about the mid point of the popula- tion. Therefore, we expect that half of the sampled values be below the median and the other half above the median. If this situation is not observed then we should reject the hypothesis. 1 (large-sample wilcoxon singed rank test statis- tic).
