a. What does it mean that the null hypothesis is a straw man to be knocked down? In your answer, describe the purpose of null hypotheses and alternative hypotheses.
b.What is meant by the term directional hypothesis, and what information would a researcher need to form such a directional hypothesis?
c. What is a parametric test, and how does a parametric test differ from a nonparametric test? In your response, discuss assumptions of parametric tests.