Recent research into the cost of various medical procedures has shown the impact of certain complications encountered in surgery on the total cost of a patient's stay in the hospital. The researchers used regression analysis and found the following results Total cost for patient Constant, plus Length of stay (measured in days), plus b x Presence of one or more complications (1 if true, 0 if false), plus c x Use of a laparoscope1 if true, 0 if false) Where a, b, c are coefficients of the regression model, and The laparoscope is an instrument somewhat like a miniature telescope with a fiber optic system which brings light into the abdomen. It is about as big around as a fountain pen and twice as long The research, based on 55 patients, showed the following regression results R-squared: 49% Constant term: $3,178 Coefficients and t-values for independent variables Length of Stay Complication Laparoscope Coefficient t-value $820 7.15 $1,995 4.48 $979 2.69 Required: 1. What is the estimated cost for a patient whose surgery has complications and who stays in the hospital four days, and whose surgery requires a laparoscope? Estimated cost 2. Which, if any, dummy variables are used in this regression? (You may select more than one answer. Click the box with a check mark for the correct answer and click to empty the box for the wrong answer.) Presence of one or more complications Use of a laparoscope (or not) Length of stay (measured in days)