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Fill in the blank below. The variable measured in an experiment is called 0 a sampling unit 0 the response variable 0 the predictor variable 0 the treatment Determine whether the underlined value is a parameter or a statistic. In a survey conducted in a certain town, 24% of adult respondents reported that they had been involved in at least one car accident in the past ten years. O parameter 0 statistic Determine whether the study depicts an observational study or an experiment. A poll is conducted in which professional musicians are asked their ages. O experiment 0 observational study