In this equation to solve it only gives x2= 2 for black. Do you assign zero for x2 otherwise?Answers: 62.6 minutes2.4 minutes 21.1 minutes54.0 minutesI chose D but want to make sure it is ok to assume x2 can be 0

This begins Exercise 1 which consists of questions 1-16 The 2010 National Hospital Ambulatory Medical Care Survey (NHAMCS) is a national (United States) sample survey of visits to hospital outpatient and emergency departments. This survey was conducted by the National Center for Health Statistics. In this exercise, multiple linear regression will be used to examine factors associated with patient waiting time (in minutes) of persons admitted to the Emergency Departments (EDS) of participating hospitals in 2010. The average waiting time reported by the over 27,000 survey participants is 56.3 minutes (s= 78.7 minutes, with a range of 0 to 1,335 minutes). The linear regression that relates average time to visitors' sex, racial identity (white (reference), black, other), insurance type (private vs not private), and systolic blood pressure (mmHg) is of the form: y = Bo+ Bix1 + $2x2 + B3x3 + Bax4 + Agxs where x1 = 1 for female (0 for male); x2 = 1 for black, x3 = 1 for other racial identity; x4= 1 for private insurance, 0 for non-private; x5 = systolic blood pressure (mmHg). The regression equation with the actual intercept and slope estimates is: y = 62.6 + -2.4x1 + 18.8x2 + 1.7x3 + -7.9x4 +-0.05xs BP - Based on these results, what is the estimated mean waiting time for females who identify as white, who do not have private insurance, with systolic blood pressures of 125 mmHg? (rounded to the nearest integer) a. 62.6 minutes 62.6 + - 2. 4 (1)2+ (18. 8 (0) 4 D. 7 (1) +-7.9(0 )+0,05(125) b. 2.4 minutes - 55. 65 c. 21.1 minutes