The efficiency for a steel specimen immersed in a phosphating tank is the weight of the phosphate coating divided by the metal loss (both in mg/ft2). an article gave the accompanying data on tank temperature (x) and efficiency ratio (v). temp 170 172 173 174 174 175 176 177 ratio 0.76 1.27 1.48 0.99 0.99 1.02 1.12 1.70 temp. 180 180 180 180 180 181 181 182 ratio 1.43 1.50 1.57 2.15 2.11 0.88 1.33 0.84 temp. 182 182 182 184 184 185 186 188 ratio 1.73 2.04 2.70 1.59 2.62 3.10 1.89 3.18 (a) determine the equation of the estimated regression line. (round all numerical values to five decimal places.) y = . 1017x-16.592 レ 19174x (b) calculate a point estimate for true average efficiency ratio when tank temperature is 182. (round your answer to four decimal places.) 1.9174 (c) calculate the values of the residuals from the least squares line for the four observations for which temperature is 182. (round your answers to four decimal places.) (182, 0.84) 1581 (182, 1.73) (182, 2.04) (182, 2.70)