Listen to the audio and then answer the following question. Feel free to listen to the audio as many times as necessary before answering the question. How many siblings does Ricardo have? cero uno dos tres

You want to test the hypothesis that smoking cigarettes increases the risk of lung cancer. in your experiment, you take 100 people of various ages and genders for each of your groups. one group smokes. the other group does not smoke. the group that does not smoke is called the group