Unit 3: Collecting Data

A school district wants to survey parents about satisfaction with remote learning. There are 2,000 families across 5 schools (400 per school).

A pharmaceutical company wants to test whether a new drug reduces blood pressure more effectively than a placebo. They have 60 volunteers with high blood pressure.

A health researcher wants to study whether drinking coffee is associated with higher rates of heart disease.

A city government wants to know if residents support a proposed tax increase to fund public parks.

Four study designs are described: (I) Volunteers are randomly assigned to exercise or no exercise for 6 months. Heart health is measured. (II) A random sample of adults is surveyed about exercise habits and heart health. (III) Volunteers are asked ab

A quality control engineer at a factory needs to inspect items produced on an assembly line. The factory produces 10,000 items per day across 50 machines (200 items per machine).

A researcher wants to test whether a new keyboard layout increases typing speed.