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In the population of drivers, the mean number of traffic violations in the last 10 years is 5.2. In a random sample of 300 drivers,

In the population of drivers, the mean number of traffic violations in the last 10 years is 5.2. In a random sample of 300 drivers, the mean number of moving violations is 4.25. The difference between 5.2 and 4.25 is due to _______.

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