A similar argument works in the continuous case but

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A similar argument works in the continuous case, but we need to switch the order of the integration. 43
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EXAMPLE : Suppose hourly wage Y is related to education X as E Y | X 5.8 .40 X If the average education level in the population is 12.5, then we can find the average hourly wage: E Y E 5.8 .40 X 5.8 .40 E X 5.8 .40 12.5 10.8, or $10.80. 44
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