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Which control chart used for track the rejection in the maintenance project when the bug arrival pattern is not constant?

P Chart.


Jenny recorded the effects of eating spinach on her health. Which of these is a control variable?

The control variable (or scientific constant) in scientific experimentation is the experimental element which is constant and unchanged throughout the course of the investigation.Eating Spinach


Maria recorded the effects of doing homework on her intelligence. Which of these is a control variable?

The control variable (or scientific constant) in scientific experimentation is the experimental element which is constant and unchanged throughout the course of the investigation. Doing Homework


How many independent variables should an investigation have?

There can only be one independent and one dependent variable. All other variables should be classed as control variables and must be kept constant to achieve a fair test.


What is the importance of statistics in quality control?

Your question is very general. I will try to answer it the best I can. As QC is usually taught in the universities (part of industrial engineering), there is typically a strong emphasis on the statistical aspects. However, in the industrial environment, as quality relates to human observation and error, the importance of statistics will depend on the product. If every product is inspected thoroughly, then the concepts of random sampling and acceptance-rejection criteria are not important. Quality control will focus on how to inspect, and spot defects. However, if inspection of every product is impractical, the inspections are done by sampling. In this case, knowledge of statistics is very important. Questions will arise on how many lots to inspect, and the criteria for acceptance and rejection. If too tight a criteria for acceptance is used, then many acceptable products will be discarded (Type I error). It too loose a criteria for acceptance is used, then many unacceptable productions will be sent to customers (Type II error).