Statistics Question

How would you select appropriate statistical tests for analysis research data? What aspects of research questions or data types are relevant considerations in choosing your tests? Why?  Make sure you reference the appropriate principles from the text we have been studying together.  Make sure to include something on distribution of our data......

Why is the coefficient of correlation an important tool for statisticians? Provide some specific examples from real life. Make sure you reference the principles we have been studying together to support any assertions or claims you make.