The efficiency (%) of a 0.7 L Daihatsu diesel engine at 3100 rpm was determined at various torques (N-m) and coolant temperatures (°C), resulting in the following data kindly provided by the study’s authors (“Performance of a Diesel Engine at High Coolant Temperatures, J. Energy Resour. Technol. 2017).

a. Test at the .01 significance level whether mean engine efficiency differs with torque.
b. Test at the .01 significance level whether mean engine efficiency differs with coolant temperature.
c. Apply Tukey’s procedure as appropriate to the results of (a) and (b).

Transcribed Image Text:

Coolant Temp. (°C) 90 100 125 150 175 200 24.07 23.81 23.55 22.84 24.34 24.62 26.52 26.00 26.06 25.33 26.92 27.08 26.42 28.94 28.74 27.16 29.35 29.16 28.20 26.55 28.87 27.27 12 15 Torque 18 28.50 28.23 26.67 21 28.61 29.96 28.38 24 28.47 28.34