Psychologists tend to believe that there is a relationship between aggressiveness and order of birth. To test this belief, a psychologist chose 500 elementary school students at random and administered a test to each student that was designed to measure the student’s aggressiveness. Each student was then classified according to one of four categories. The percentages of students falling into the

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Q: In a survey of consumers aged 12 and older, respondents were asked how many cell phones were in use…

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