17. 1 point Also of interest is whether there are any differences in the waiting time distributions by self reported race of the survey participants. Participants classified themselves into 1 of 3 racial categories: while, black, other (did not identify as either black or white). Following are the results from a simple regression performed to relate waiting time to race: 9: 51.5 +19.3x1 + 2.6x2 where x1=1 if the respondent identifies as black (and 0 if not), and X2=1 if the participant identifies as other (0 if not). The standard error of the slope for x1is 1.2, and for x2 is 2.5. The R2 is 0.01. > > U n a n s w e r e CI 0 u e s t I o n 5 Suppose the x's were recoded as x1 =1 for White (and 0 if not), and x2 =1 for Black (and 0 if not), and the following regression model was fit to the data with the recoded x values: )7 = 30 +31x1 + gxg . What would be the value of the intercept ([30) for this model? D a. 51.5 minutes D b. 70.8 minutes D c. 54.1 minutes