Questions from Engineering Statistics

Q: List the aliases for the various effects in a 25 factorial experiment

List the aliases for the various effects in a 25 factorial experiment when the defining contrast is ACDE.

Q: (a) Obtain a 1/2 fraction of a 24

(a) Obtain a 1/2 fraction of a 24 factorial design using BCD as the defining contrast. (b) Divide the 1/2 fraction into 2 blocks of 4 units each by confounding ABC. (c) Show the analysis-of-variance t...

Q: In an experiment conducted by the Mining Engineering Department at Virginia Tech

In an experiment conducted by the Mining Engineering Department at Virginia Tech to study a particular filtering system for coal, a coagulant was added to a solution in a tank containing coal and slud...

Q: Construct a 1/4 fraction of a 26 factorial design using

Construct a 1/4 fraction of a 26 factorial design using ABCD and BDEF as the defining contrasts. Show what effects are aliased with the six main effects.

Q: (a) Using the defining contrasts ABCE and ABDF, obtain

(a) Using the defining contrasts ABCE and ABDF, obtain a 1/4 fraction of a 26 design. (b) Show the analysis-of-variance table (sources of variation and degrees of freedom) for all appropriate tests, a...

Q: A random sample of 15 adults living in a small town were

A random sample of 15 adults living in a small town were selected to estimate the proportion of voters favoring a certain candidate for mayor. Each individual was also asked if he or she was a college...

Q: Seven factors are varied at two levels in an experiment involving only

Seven factors are varied at two levels in an experiment involving only 16 trials. A 1/8 fraction of a 27 factorial experiment is used, with the defining contrasts being ACD, BEF, and CEG. The data are...

Q: An experiment is conducted so that an engineer can gain insight into

An experiment is conducted so that an engineer can gain insight into the influence of sealing temperature A, cooling bar temperature B, percent polyethylene additive C, and pressure D on the seal stre...

Q: In an experiment conducted at the Department of Mechanical Engineering and analyzed

In an experiment conducted at the Department of Mechanical Engineering and analyzed by the Statistics Consulting Center at Virginia Tech, a sensor detects an electrical charge each time a turbine blad...

Q: In the study Durability of Rubber to Steel Adhesively Bonded Joints,

In the study Durability of Rubber to Steel Adhesively Bonded Joints, conducted at the Department of Environmental Science and Mechanics and analyzed by the Statistics Consulting Center at Virginia Tec...