13.64 Effect of poverty on crime Refer to the previous exercise.

Now we add x3 = percentage of single-parent families to the model. The SPSS table below shows results.

Without x3 in the model, poverty has slope 28.33, and when x3 is added, poverty has slope 14.95. Explain the differences in the interpretations of these two slopes.

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Violent crime predicted by poverty rate, urbanization, and single-parent family Coefficients Unstandardized Coefficients Model B Std. Errort t Sig. 1 (Constant) -631.700 149.604 -4.222 .000 poverty 14.953. 7.540 1.983 .053 urbanization 4.406 .973 4.528 .000 singleparent 25.362 7.220 3.513 .001 a Dependent Variable: violent crime rate.