LSSGB Exam The average time it takes to repair headphones at a factory repair ce
ID: 3369055 • Letter: L
Question
LSSGB Exam The average time it takes to repair headphones at a factory repair center is 90 hours with a standard deviation of 10 hours. To monitor this process daily, samples of 15 headphones are taken and the mean time computed. Today, the mean time was 84 5 hours. Suppose a similar sample of 15 headphones was undertaken shortly after the first sample was taken. The mean of both samples would be expected to be the same if the process is in-control 23. True False ? Prev Page Next P ivsc Polic Software by brExplanation / Answer
If a process is in control, we know what to expect in the finished product. Statistical quality control only pays attention to the internal state of the process.
In quality control, process whose measure under evaluation is in a state of statistical control. In such processes, variations among the observed samples can be attributed to a constant system of chance causes.
Process is “In control”, if it has Only natural variations
If the plot looks non-random, that is, if the points exhibit some form of systematic behavior, there is still something wrong. For example, if the first 25 of 30 points fall above the center line and the last 5 fall below the center line, we would wish to know why this is so. Statistical methods to detect sequences or nonrandom patterns can be applied to the interpretation of control charts. To be sure, "in control" implies that all points are between the control limits and they form a random pattern.
If a data point falls outside the control limits, we assume that the process is probably out of control and that an investigation is warranted to find and eliminate the cause or causes
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