14. 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: )7 :515 +19.3X1+ 2.6x; where x121 if the respondent identifies as black (and 0 if not), and x221 if the participant identifies as other (0 if not). The standard error of the slope for X1 is 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 s - Based on these regression results, what is the estimated mean difference in waiting times (and 95% CI) for Other compared to White? D a. 51.5 minutes; (50.0, 53.0) minutes D b. 19.3 minutes; (169, 21.7) minutes D c. 2.6 minutes ; (-2.4, 7.6) minutes 15. 1 point