Refer to the Environmental Science & Technology study of sorption of organic vapors, Exercise 12.45. Consider using the quantitative variable, relative humidity, and the qualitative variable, organic compound (at five levels), to model the retention coefficient y.

a. Write a complete second-order model that relates E(y) to relative humidity and organic compound.

b. Under what circumstances will the response curves of the model of part a possess the same shape but have different y-intercepts?

c. Under what circumstances will the response curves of the model of part a be parallel lines?

d. Under what circumstances will the response curves of the model of part a be identical?

Data from Exercise 12.45

Refer to the Environmental Science & Technology study of sorption of organic vapors, Exercise 12.7. The independent variables used to model the retention coefficient y are 

Data from Exercise 12.7

Environmental Science & Technology (Oct. 1993) published an article that investigated the variables that affect the sorption of organic vapors on clay minerals. The independent variables and levels considered in the study are listed here. Identify the type (quantitative or qualitative) of each.

Transcribed Image Text:

X = Temperature (degrees) %3D X = Relative humidity (percent) Organic compound = (benzene, toluene, chloroform, %3D methanol, and anisole)