5.What is statistical significance? What is the proper use of this concept? Why is the concept often misunderstood?

5.What is statistical significance? What is the proper use of this concept? Why is the concept often misunderstood? 

6. What are the two types of statistical errors that can occur in hypothesis testing? Describe each one and provide an example. 

7. How do parametric and non-parametric statistics differ from one another?

 8. Why should researchers plan their data analyses in advance of data collection?