Dr. harrison examines the number of traumatic head injuries that occurred in california for five years before and after the passage of a law requiring the wearing of a helmet. his design would be classified as:

Descriptive research

Explanation:

In a descriptive research design, a researcher(Dr. Harrison) is solely interested in describing the situation or case under his research study. It is a theory-based research design which is created by gather, analyze and presents collected data. By implementing an in-depth research design such as this, a researcher can provide insights into the why and how of research.

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .