Concept explainers
The viscosity (y) of an oil was measured by a cone and plate viscometer at six different cone speeds (x). It was assumed that a quadratic regression model was appropriate, and the estimated regression
y = −2113.0937 + 3.3684x − .01780x2
a. Estimate
b. What viscosity would you predict for a cone speed of 60 rpm?
c. If
d. From part (c), SST=8386.43 − (210.70)2/6 = 987.35. Using SSE computed in part (c), what is the computed value of R2?
e. If the estimated standard deviation of
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Chapter 13 Solutions
Student Solutions Manual for Devore's Probability and Statistics for Engineering and the Sciences, 9th
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