7. Multiple regression analysis is used to study how an individual’s income (y, in thousands of dollars) is influenced by age (x1, in years), level of education (22, ranging from 1 to 5), and the individual’s gender (23, where 0 = female and 1 = male). The following shows parts of the regression output for a sample of 20 individuals. 21 Variable Coefficient 0.63 0.92 -0.51 S Sres = 112, SSexp = 84 Standard Error 0.09 0.19 0.92 23 (a) Compute the multiple coefficient of determination. (b) Interpret the estimated coefficient for x3. (c) Perform a t test to determine whether the coefficient for the “level of education” is significantly different from zero. Use a = 0.05.
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