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In a study of the effects of the flu shot, independent samples were taken of 500 adults who received the shot and 500 adults who
In a study of the effects of the flu shot, independent samples were taken of 500 adults who received the shot and 500 adults who did not receive the flu shot in each of three major cities. The number of people who were diagnosed with the flu was recorded. What are the specific variables in this study and the number of levels for each
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