Of the following four scenarios, which survey results are likely to be the most statistically significant and which are likely to be the least statistically significant. Explain your answer.
Scenario 1: In a study to see if Yankees’ fans or Astros’ fans spend more on concessions at a baseball game, 20 people are surveyed as they enter Yankee Stadium in New York and 20 people are surveyed as they enter Minute Maid Park in Houston.
Scenario 2: 700 people are surveyed one year after completing a court-mandated defensive driving class for a study to see if their driving record improved following the completion of the class.
Scenario 3: 75 sophomore engineering majors at Ohio State University are surveyed for a study to see if attending a seminar on the best ways to obtain scholarship money was effective in getting additional money for school.
Scenario 4: 500 recently retired Pennsylvania coal miners are surveyed for a study to determine if working in the coal mines has led to a medical diagnosis of coal worker’s pneumoconiosis (CWP), commonly referred to as black lung disease.