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: y: 51.5 +19.3x1 + 2.61:2 where x121 if the respondent identifies as black (and 0 if not), and X221 if the participant identies 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: 31 = [30 +/A31x1 + zxz . What would be the value of the slope for x1 (31) for this model? D a. 16.7 minutes I: b. 19.3 minutes I: c. 2.6 minutes I: d. -16.7 minutes