Classify each of the following research studies as experimental, correlational, or observational/qualitative.

Cheryl Vance, an actuary at Value Life Insurance Co., aims to determine whether the accident rate differs for two-door versus four-door versions of the same car model. She gathers National Highway Traffic Safety Administration (NHTSA) data on eight car models, each of which has both two- and four-door versions, and compares the accident rate for both versions. She finds that overall, the two-door versions have an accident rate that is 136% of that of the four-door versions.

Research method: _______________

Explanation:

Gerald Mims wants to test the hypothesis that companies with larger advertising budgets will have larger market shares. He gathers data on the size of advertising budget and the market share for 142 medium-sized companies. He finds that companies with larger advertising budgets do in fact have larger market shares.

Research method: ________________

Explanation: