You will see more about the distinction between statistics and parameters in

You will see more about the distinction between

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You will see more about the distinction between statistics and parameters in the next chapter and beyond. Population standard deviation: σ N x i = 2 ) ( µ where N is the size of the population. Empirical Rule For bell-shaped curves, approximately… 68% of the values fall within 1 standard deviation of the mean in either direction. 95% of the values fall within 2 standard deviations of the mean in either direction. 99.7% of the values fall within 3 standard deviations of the mean in either direction.