Types of Surveys

“A researcher wants to determine the average amount of time students in your Algebra 2 Career class spend on homework each night. Which method, survey, observational study, or experiment, would be most appropriate for this scenario and why? A company wants to know if a new advertisement campaign is effective at increasing sales. Which method, survey, observational study, or experiment, would be most appropriate for this scenario and why? A school principal wants to know if offering free tutoring after school improves students' grades in mathematics. Which method, survey, observational study, or experiment, would be most appropriate for this scenario and why?”