A researcher on superstition decided to investigate if walking under a ladder really brought about bad luck. He took 100 people to his laboratory, one at a time. As each person entered, he flipped a coin. If it turned up Heads, he had the person walk under a ladder; Tails, the person walked next to the ladder. A week later, each participant returned and reported if anything unlucky had happened during the week.

Determine if the study is descriptive, experimental, quasi-experimental, or correlational.