Artificial joints consist of a ceramic ball mounted on a taper. The article "Friction in Orthopaedic Zirconia Taper Assemblies" (W. Macdonald, A. Áspenberg, et al., Proceedings of the Institution of Mechanical Engineers, 2000: 685-692) presents data on the coefficient of friction for a push-on load of 2 kN for taper assemblies made from two zirconium alloys and employing three different neck lengths. Five measurements were made for each combination of material and neck length. The results presented in the following table are consistent with the cell means and standard deviations presented in the article. Тарег Material Neck Length Coefficient of Friction CPTI-ZIO2 CPTI-Z:O, CPTI-Z:O, Long TIAlloy-ZrO, Short TiAlloy-ZrO, Medium TiAlloy-ZrO, Long Short 0.254 0.195 0.281 0.289 0.220 Medium 0.196 0.220 0.185 0.259 0.197 0.329 0.481 0.320 0.296 0.178 0.150 0.118 0.158 0.175 0.131 0.180 0.184 0.154 0.156 0.177 0.178 0.198 0.201 0.199 0.210 Compute the main effects and interactions. Construct an ANOVA table. You may give ranges for the P-values. Is the additive model plausible? Provide the value of the test statistic, its null distribution, and the P-value. a. Б. C. d. Can the effect of material on the coefficient of friction be described by interpreting the main effects of material? If so, interpret the main effects. If not, explain why not. Can the effect of neck length on the coefficient of friction be described by interpreting the main effects of neck length? If so, interpret the main effects, using multiple comparisons at the 5% level if necessary. If not, explain why not. e.

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Artificial joints consist of a ceramic ball mounted on a taper. The article "Friction in
Orthopaedic Zirconia Taper Assemblies" (W. Macdonald, A. Áspenberg, et al., Proceedings
of the Institution of Mechanical Engineers, 2000: 685-692) presents data on the coefficient
of friction for a push-on load of 2 kN for taper assemblies made from two zirconium alloys
and employing three different neck lengths. Five measurements were made for each
combination of material and neck length. The results presented in the following table are
consistent with the cell means and standard deviations presented in the article.
Тарег
Material
Neck
Length
Coefficient of Friction
CPTI-ZIO2
CPTI-Z:O,
CPTI-Z:O, Long
TIAlloy-ZrO, Short
TiAlloy-ZrO, Medium
TiAlloy-ZrO, Long
Short
0.254 0.195 0.281 0.289 0.220
Medium
0.196 0.220 0.185 0.259 0.197
0.329 0.481 0.320 0.296 0.178
0.150 0.118 0.158 0.175 0.131
0.180 0.184 0.154 0.156 0.177
0.178 0.198 0.201 0.199 0.210
Compute the main effects and interactions.
Construct an ANOVA table. You may give ranges for the P-values.
Is the additive model plausible? Provide the value of the test statistic, its null
distribution, and the P-value.
a.
Б.
C.
d.
Can the effect of material on the coefficient of friction be described by interpreting the
main effects of material? If so, interpret the main effects. If not, explain why not.
Can the effect of neck length on the coefficient of friction be described by interpreting
the main effects of neck length? If so, interpret the main effects, using multiple
comparisons at the 5% level if necessary. If not, explain why not.
e.
Transcribed Image Text:Artificial joints consist of a ceramic ball mounted on a taper. The article "Friction in Orthopaedic Zirconia Taper Assemblies" (W. Macdonald, A. Áspenberg, et al., Proceedings of the Institution of Mechanical Engineers, 2000: 685-692) presents data on the coefficient of friction for a push-on load of 2 kN for taper assemblies made from two zirconium alloys and employing three different neck lengths. Five measurements were made for each combination of material and neck length. The results presented in the following table are consistent with the cell means and standard deviations presented in the article. Тарег Material Neck Length Coefficient of Friction CPTI-ZIO2 CPTI-Z:O, CPTI-Z:O, Long TIAlloy-ZrO, Short TiAlloy-ZrO, Medium TiAlloy-ZrO, Long Short 0.254 0.195 0.281 0.289 0.220 Medium 0.196 0.220 0.185 0.259 0.197 0.329 0.481 0.320 0.296 0.178 0.150 0.118 0.158 0.175 0.131 0.180 0.184 0.154 0.156 0.177 0.178 0.198 0.201 0.199 0.210 Compute the main effects and interactions. Construct an ANOVA table. You may give ranges for the P-values. Is the additive model plausible? Provide the value of the test statistic, its null distribution, and the P-value. a. Б. C. d. Can the effect of material on the coefficient of friction be described by interpreting the main effects of material? If so, interpret the main effects. If not, explain why not. Can the effect of neck length on the coefficient of friction be described by interpreting the main effects of neck length? If so, interpret the main effects, using multiple comparisons at the 5% level if necessary. If not, explain why not. e.
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