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. 171 173 174 176 Ratio 0.86 1.25 1.32 1.05 0.99 1.14 0.98 1.76 y= Temp. 183 183 Ratio 1.79 1.96 1.96 175 175 LAUSE SALT 177 Temp. 181 181 181 181 181 182 182 183 Ratio 1.47 1.62 1.53 2.11 2.23 0.86 1.45 0.84 178 183 185 185 186 187 189 2.72 1.57 2.42 3.10 1.89 3.06 (a) Determine the equation of the estimated regression line. (Round all numerical values to four decimal places.) (b) Calculate a point estimate for true average efficiency ratio when tank temperature is 183. (Round your answer to four decimal places.) (c) Calculate the values of the residuals from the least squares line for the four observations for which temperature is 183. (Round your answers to two decimal places.) (183, 0.84) (183, 1.79) (183, 1.96) (183, 2.72) Why do they not all have the same sign? O These residuals do not all have the same sign because in the cases of the first two pairs of observations, the observed efficiency ratios were larger than the predicted value. In the cases of the last two pairs of observations, the observed efficiency ratios were smaller than the predicted value. These residuals do not all have the same sign because in the cases of the first two pairs of observations, the observed efficiency ratios were smaller than the predicted value. In the cases of the last two pairs of observations, the observed efficiency ratios were larger than the predicted value. O These residuals do not all have the same sign because in the case of the third pair of observations, the observed efficiency ratio was equal to the predicted value. In the cases of the other pairs of observations, the observed efficiency ratios were smaller than the predicted value. O These residuals do not all have the same sign because in the case of the second pair of observations, the observed efficiency ratio was equal to the predicted value. In the cases of the other pairs of observations, the observed efficiency ratios were larger than the predicted value.

answer a,b and c.

the edge of a cube was found to be 40cm w a possible error of .2cm. use differentials to estimate a. the max possible error regarding the cube’s volume b. the relative error in the volume of the cube c. the percentage error in the volume of the cube

An experimental self-driving car is observed as it moves back an forth on a straight stretch of road. The car's velocity ( measured in meters per second) is a function of time (measured in seconds). The velocity is shown in the graph below. Positive velocities mean the car is moving toward the east and negative velocities mean its motion is toward the west. Using the values given below for the labeled areas in the graph, determine how far east of its starting position the car was at the end of t = 10 seconds. A = 2 B = 8 C = 15 Velocity in meters per second Time t = 10 В seconds