Hw4_soln5 - HW Set 4 Due 4/27 in quiz session HW9 3.21(c,d use the print-out given in the problem as much as possible 3.22(By computer The

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: HW Set 4: Due 4/27 in quiz session. HW9: 3.21(c,d; use the print-out given in the problem as much as possible.), 3.22 (By computer. The statement "assess the quality of the fit, ..." means "Compute R-squared and interpret it.") 3.25(b,c,d; by hand) . HW10: hw_P, hw_Q, hw_R (end of lecture 12; all by computer). HW11: hw_S and hw_T (lecture 13). Graded problems (and points): TBA. 3.21 (c) The least squares line is y ˆ = 3.2925 + .10748x. For a beam whose modulus of elasticity is x = 40, the predicted strength would be y ˆ = 3.2925 + .10748(40) = 7.59. The value x = 100 is far beyond the range of the x values in the data, so it would be dangerous (i.e., potentially misleading) to extrapolate the linear relationship that far. (d) From the printout, SSResid = 18.736, SSTo = 71.605, and the coefficient of determination is r 2 = .738 (or, 73.8%) . The r 2 value is large, which suggests that the linear relationship is a useful approximation to the true relationship between these two variables. 3.22 Using Minitab to run this regression, we obtain the following least squares regression line: x y 00882 . 86 . 2 ˆ + = 40 50 60 70 80 90 100 110 3.2 3.3 3.4 3.5 3.6 3.7 3.8 thickness wavelength Regression Plot 96.1% of the observed variation in PL wavelength can be attributed to the 96....
View Full Document

This document was uploaded on 05/15/2010.

Page1 / 7

Hw4_soln5 - HW Set 4 Due 4/27 in quiz session HW9 3.21(c,d use the print-out given in the problem as much as possible 3.22(By computer The

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online