How do I make statistical inference from experimental test data which is not normally distributed
Only if the absence of a maintenance program adversely affects product quality.
To answer this question for yourself, analyze the system you already use to run your business then see actions 1 and 2 or 3 and 4 below.
1. Does it include a maintenance program?
2. If it does then include this in your quality management system.
3. If it does not then seek evidence of any product quality problems.
4. If the absence of a maintenance program affects product quality then work with your maintenance manager to design and implement a new process. Document this process to the extent necessary for its effective planning, operation and control (see 4.2.1d).
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