Andrey works at a call center, selling insurance over the phone. While debating over which greeting he should use when calling potential customers - “Howdy!” or “Hiya!” - he decided to conduct a small study.
For his subsequent 500 calls, he chose one of the greetings randomly by flipping a coin. Then, he compared the percentage of calls he succeeded in selling insurance using each greeting.
What type of a statistical study did Andrey use?
Part 2: Andrey found that the success rate of the conversation that started with “Howdy!” was 20 percent greater than the success rate of the conversation that started with “Hiya!” Based on some re-randomization simulations, he concluded that the result is significant and not due to the randomization of the calls.