13.11. Refer to the previous exercise. The means of percentage registered for the three categories are x

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13.11. Refer to the previous exercise. The means of percentage registered for the three categories are x\ - 76.2, *2 - 49.5, J3 = 39.7. The overall mean x = 60.4.

(a) Find the adjusted mean on percentage voting for Anglos. Compare it to the unadjusted mean of 52.3, and interpret.

(b) Sketch a plot of the no interaction model for these data, and identify on it the unadjusted and adjusted means for Anglos.

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