Questions from Engineering Statistics

Q: In Case Study 15.2 involving the coal cleansing data,

In Case Study 15.2 involving the coal cleansing data, the percent solids in the process system is known to vary uncontrollably during the process and is viewed as a noise factor with mean 0 and varian...

Q: Use the coal cleansing data of Exercise 15.2 on page

Use the coal cleansing data of Exercise 15.2 on page 609 to fit a model of the type E(Y ) = β0 + β1x1 + β2x2 + β3x3, where the levels are x1, percent s...

Q: A 25 factorial plan is used to build a regression model containing

A 25 factorial plan is used to build a regression model containing first-order coefficients and model terms for all two-factor interactions. Duplicate runs are made for each factor. Outline the analys...

Q: Consider the 1/16 of the 27 factorial discussed in Section

Consider the 1/16 of the 27 factorial discussed in Section 15.9. List the additional 11 defining contrasts.

Q: Construct a Plackett-Burman design for 10 variables containing 24 experimental

Construct a Plackett-Burman design for 10 variables containing 24 experimental runs.

Q: A Plackett-Burman design was used to study the rheological properties

A Plackett-Burman design was used to study the rheological properties of high-molecular-weight copolymers. Two levels of each of six variables were fixed in the experiment. The viscosity of the polyme...

Q: A preliminary experiment is conducted to study the effects of four factors

A preliminary experiment is conducted to study the effects of four factors and their interactions on the output of a certain machining operation. Two runs are made at each of the treatment combination...

Q: Use the runs test to test, at level 0.01

Use the runs test to test, at level 0.01, whether there is a difference in the average operating time for the two calculators of Exercise 16.17 on page 670. Exercise 16.17: The following data represe...

Q: A large petroleum company in the Southwest regularly conducts experiments to test

A large petroleum company in the Southwest regularly conducts experiments to test additives to drilling fluids. Plastic viscosity is a rheological measure reflecting the thickness of the fluid. Variou...

Q: A 22 factorial experiment is analyzed by the Statistics Consulting Center at

A 22 factorial experiment is analyzed by the Statistics Consulting Center at Virginia Tech. The client is a member of the Department of Housing, Interior Design, and Resource Management. The client is...