An industrial experiment was conducted to test the reliability of rotary steppin
ID: 2957039 • Letter: A
Question
An industrial experiment was conducted to test the reliability of rotary steppingswitches. Four factors were considered at each of two levels.
Factor Low level High level
A. Lubrication Dry Lubricated
B. Dust Protection Unprotected Enclosed in dust cover
C. Current 0.25 amps 0.5 amps
D. Spark Suppression No Yes
Each switch was run continuously until it failed (results were measured in min-
utes), so the higher the result the better. The runs were performed in random order.
Minutes Minutes Minutes Minutes Minutes
3772 1 1 -1 -1
3602 1 -1 -1 1
2942 -1 -1 -1 -1
2655 -1 -1 1 -1
3555 1 -1 1 1
4001 -1 1 -1 -1
4059 -1 1 1 1
3986 1 1 -1 1
2906 1 -1 -1 -1
3193 -1 -1 1 1
2839 1 -1 1 -1
4229 1 1 1 1
3459 -1 -1 -1 1
4034 -1 1 -1 1
4009 -1 1 1 -1
3993 1 1 1 -1
Determine the main effects and interaction effects. (show manual working for
at least two main effects and two interactions, and then use Minitab/R to
obtain the whole set).
Explanation / Answer
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