3. A research organization designed an experiment to test the effects of an educational TV show and its website on the learning of mathematical reasoning among upper elementary school students. The website had two type of activities: basic and advanced. The available students were randomly assigned to watch the show or not. Among these same students, some were randomly assigned to skip the website while others were randomly assigned to use the website. Among the latter, some were randomly assigned to do only the basic activities and the rest to do both the basic and advanced activities. Then, students took a variety of mathematical reasoning tests