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A sheriff is interested in the average speed that people drive on Highway 1. Officers used radar to check speeds of a sample of 300 cars. The average speed for the sample was 68 mph. The sheriff concluded that the average speed on Highway 1 is greater than the speed limit. a) What is the sample for this study? [ Select ] b) What is the population for this study? [ Select ] c) What is the statistic from this study? [ Select ] d) What is the variable? [ Select ] e) Is this an experimental study, or an observational study? [ Select ]