Nomparametric testing

Please, read chapter 9 from the textbook which introduces nonparametric testing. 

As you remember from prior weeks, data can be classified as categorical or numerical (quantitative). The hypothesis tests for categorical data are referred to as nonparametric.

Explain the following in 200-250 words:

a) What is the purpose of using nonparametric tests in operations management decisions?

b) Provide examples of what you look for when conducting these tests.