Assume that data from a 23 des

Assume that data from a 23 design have been analyzed  , and one or more of the interactions are significant. What action should be taken in investigating main effects for factors that comprise those interactions?

Six similar (but not identical) machines are used in a production process. Each machine has a head that is not interchangeable between machines, although there are three different types of heads that can be used on a given machine. A study is to be performed to analyze process variability by studying the six machines and three heads. Could the data be analyzed as a 3 × 6 factorial design? Why or why not?

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