Guide approach:

After having carried out the readings and research on non-parametric tests, answer the following premises explaining your approach in detail:

A goodness-of-fit test indicates whether a set of observed frequencies can come from a normal distribution, but it can also be used to determine whether a sample of observations comes from a normal population.

Can the chi-square value be negative? explain.

Explain the fundamentals of the Wilcoxon test of the rank sum of independent samples and when it is appropriate to use it.