The Turbine Oil Oxidation Test (TOST) and the Rotating Bomb Oxidation Test (RBOT

Question

The Turbine Oil Oxidation Test (TOST) and the Rotating Bomb Oxidation Test (RBOT) are two different procedures for evaluating the oxidation stability of steam turbine oils. An article reported the accompanying observations on X-TOST time (hr) and y- RBOT time (min) for 12 oil specimens TOST 4200 3600 3750 3650 4050 2795 RBOT 370 340 375 315 350 205 TOST 4870 4525 3450 2675 3750 3300 RBOT 400 375 285 220 345 285 (a) Calculate the value of the sample correlation coefficient. (Round your answer to four decimal places.) Interpret the value of the sample correlation coefficient. O The value of r indicates that there is a strong, negative linear relationship between TOST and RBOT O The value of r indicates that there is a strong, positive linear relationship between TOST and RBOT. O The value of r indicates that there is a weak, negative linear relationship between TOST and RBOT. O The value of r indicates that there is a weak, positive linear relationship between TOST and RBOT (b) How would the value of r be affected if we had let x-RBOT time and y TOST time? O The value of r would be multiplied by -1 O The value of r would decrease. O The value of r would increase O The value of r would remain the same (c) How would the value of r be affected if RBOT time were expressed in hours? O The value of r would decrease O The value of r would be multiplied by -1 O The value of r would remain the same O The value of r would increase

Explanation / Answer

a) Sample correlation coefficient would be 0.9244

Interpret

Option B is Correct because r is positive and close to 1

b) Option D is Correct. It will be remain same.

c) Option C is Correct. It will be remain same.

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