Which of these is not a part of SPC’s 7 tools?

Which of these is not a part of SPC’s 7 tools? Correct Answer Design of Experiments

Pareto chart, check sheet, histogram, cause-and-effect diagram, scatter diagram, and control chart are all part of SPC (Statistical Process Control). Design of Experiments is not one of them.
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Related Questions

What is the general categorisation of equipments for manufacturing garments?
1. Measuring tools
2. Marking tools
3. Cutting tools
4. Pressing tools
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Which of these does not require SPC implementation?
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Computer should not be used with SPC.
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Which of the error types are likely to occur when the warning limits are used with Shewhart control charts the phase II of SPC?