Question: 13.82 Lurking variable Give an example of three variables for which you expect b 0 in the model my = a + bx1 but

13.82 Lurking variable Give an example of three variables for which you expect b • 0 in the model my = a + bx1 but b1 = 0 in the model my = a + b1 x1 + b2 x2. (Hint: The effect of x1 could be completely due to a lurking variable, x2.)

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