Question: PCB Study. article "Reduction of Defects in Wave Soldering Process" that appeared in Quality Engineering discuss a 29-5 fractional factorial experiment run in an attempt to learn how to reduce defects on printed circuit boards (PCBs). The factors studied and their levels were:
(a) How many factors that potentially affect the response variable, y, have been considered in this study?
(b) If every combination of levels of the complete list of factors were to be evaluated, how many would there be?
(c) Suppose Chowdhury and Mitra had run a 29-1 half-fraction design, how many combinations would they have considered?
(d) As mentioned above, in fact, Chowdhury and Mitra used a 29-5 fractional factorial design. How many combinations of the factors were included in their study?
(e) What fraction of the number of possible combinations were actually run?
(f) How many generators were needed in choosing the study the authors ran?
(g) For the fractional factorial actually run, how many effects were aliased with the grand mean?