In this course, we have studied confidence intervals, hypothesis tests, and linear regression. How can you decide which of these methodologies to use to resolve a given situation? Which would you use in each of these situations why?

1. Can study time and hours of sleep estimate a student's test grade?
2. Is the average size of dogs in the U.S. different from the average size of dogs in Europe?
3. How does the estimated mean cost of groceries at Whole Foods compare with that at Target?