Solution Found!
Answer: Fretting is a wear process that results from
Chapter 1, Problem 64E(choose chapter or problem)
Problem 64E
Fretting is a wear process that results from tangential oscillatory movements of small amplitude in machine parts. The article “Grease Effect on Fretting Wear (10-4 mm3)of Mild Steel” (Industrial Lubrication and Tribology, 2008: 67–78) included the following data on volume wear for base oils having four different viscosities.
a. The sample coefficient of variation100s√x assesses the extent of variability relative to the mean (specifically, the standard deviation as a percentage of the mean).Calculate the coefficient of variation for the sample at each viscosity. Then compare the results and comment.
b. Construct a comparative boxplot of the data and comment on interesting features.
Questions & Answers
QUESTION:
Problem 64E
Fretting is a wear process that results from tangential oscillatory movements of small amplitude in machine parts. The article “Grease Effect on Fretting Wear (10-4 mm3)of Mild Steel” (Industrial Lubrication and Tribology, 2008: 67–78) included the following data on volume wear for base oils having four different viscosities.
a. The sample coefficient of variation100s√x assesses the extent of variability relative to the mean (specifically, the standard deviation as a percentage of the mean).Calculate the coefficient of variation for the sample at each viscosity. Then compare the results and comment.
b. Construct a comparative boxplot of the data and comment on interesting features.
ANSWER:
Answer :
Step 1 of 3 :
Fretting is a wear process that results from tangential oscillatory movements of small amplitude in machine parts. The article “Grease Effect on Fretting Wear (10-4 mm3)of Mild Steel” , included the following data on volume wear for base oils having four different viscosities.
Viscosity |
Wear |
|||||
20.4 |
58.8 |
30.8 |
27.3 |
29.9 |
17.7 |
76.5 |
30.2 |
44.5 |
47.1 |
48.7 |
41.6 |
32.8 |
18.3 |
89.4 |
73.3 |
57.1 |
66 |
93.8 |
133.2 |
81.1 |
252.6 |
30.6 |
24.2 |
16.6 |
38.9 |
28.7 |
23.6 |