Question: In Applied Spectroscopy, the infrared reflectance spectra properties of a viscous liquid used in the electronics industry as a lubricant were studied. The designed experiment

In Applied Spectroscopy, the infrared reflectance spectra properties of a viscous liquid used in the electronics industry as a lubricant were studied. The designed experiment consisted of the effect of band frequency x₁ and film thickness x₂ on optical density y using a Perkin-Elmer Model 621 infrared spectrometer. [Source: Pachansky, J., England, C. D., and Wattman, R. "Infrared spectroscopic studies of poly (perflouropropyleneoxide) on gold substrate. A classical dispersion analysis for the refractive index" Applied Spectroscopy Vol. 40, No. 1, Jan. 1986, p. 9, Table 1] Estimate the multiple linear regression equation y = b o + b₁x₁ + b₂x₂.

X2 740 740 740 805 805 805 980 1.10 0.62 0.31 1.10

X2 740 740 740 805 805 805 980 1.10 0.62 0.31 1.10 0.62 0.31 1.10 0.62 0.31 1.10 0.62 0.231 0.107 0.053 0.129 0.069 0.030 1.005 0.559 0.321 2.948 1.633 0.934 980 980 1,235 1,235 1,235 0.31

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