Question: Hypotheses
What is a hypothesis test? Why do we need to use them to make decisions about relating sample results to the population; why can't we just make our decisions by the sample value?
REFERENCE:
Tanner, D. E., & Youssef-Morgan, C. M. (2013). Statistics for managers
Chapter 3: Applying z to Groups
Chapter 4: t-Tests: Comparing Groups to Populations and Groups to Groups