A)Following the linear regression of the number of office visits on three binary indicator variables, Midwest, South, and West, that are1if the respondent lived in that region and0otherwise. Note that Northeast was the omitted category.

Office Visits Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Intercept 10.02 0.84 11.88 0.00 8.36 11.67 Midwest -0.11 1.18 -0.09 0.93 -2.42 2.20 South -1.82 1.05 -1.74 0.08 -3.87 0.23 West 0.55 1.15 0.48 0.63 -1.70 2.80