168 A First Course in Quality Engineering
the number of times that the trials will be repeated with each treatment com-
bination in order to obtain a measure of the random variability present in the
results� In addition, the design will specify the sequence in which the trials
should be run, and is usually accompanied by a procedure for analyzing the
data from the trials and drawing conclusions�
Sometimes, an experimenter is concerned with only one factor and wants
to determine the best level of that factor to achieve the desired level of a
response� In such a case, an experiment would be conducted by running
trials at different levels of that one factor� Such an experiment is known as a
“one-factor experiment�” More often, though, we ...