(b) Calculate a point estimate for true average efficiency ratio when tank temperature is 186. Use the estimated regression line, y = -15.3492 + 0.0928x, to calculate the point estimate for the true average efficiency ratio when tank temperature is x = 186, rounded to four decimal places. y = -15.3492 + 0.0928x = -15.3492 + 0.0928 186 =1.9116 When the tank temperature is 186, we would predict an efficiency ratio of 1.3548 Submit Skip (you cannot come back)