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10.1 u ums chapter, However, it is not very difficult to obtain the results by hand calculation. The following data are from 10 health-planning districts in Vermont. Y is the percentage of live births S 2500 grams. Xl is the fertility rate for women S 17 or 2 35 years of age (Xl is known as the ' 'high-risk fertility rate."). X2 is the percentage of births to unmarried women. Compute equation for predicting the percentage of births of infants weighing less than o . (Y) on the basis of the high-risk fertility rate (Xl). SPSS, or any other available program to accomplish this (and the ; ons). next seven 9 1 District 7.4 5.7 66 43.0 55.3 48.5 38.8 46.2 399 43.1 48,5 40.0 567 9.2 12.0 10.4 9.8 9.8 7.7 10.9 9.5 1 1.6