10.5) A control chart for thickness of rolled-steel sheets is based on an upper

Question

10.5)  A control chart for thickness of rolled-steel sheets is based on an upper control limit of 0.0522 in. and a lower limit of 0.0470 in. The first ten values of the quality statistic (in this case x, the sample mean thickness of n = 5 sample sheets) are 0.0507, 0.0490, 0.0505, 0.0500, 0.0507, 0.0495, 0.0487, 0.0500, 0.0501, and 0.0478. Construct the initial part of the quality control chart, and comment on its appearance.

All ten values of the quality statistic fall outside the control limits, so an out-of-control signal is generated All ten values of the quality statistic are between the two control limits, so no out-of-control signal is generated One value of the quality statistic falls outside the control limits, so an out-of-control signal is generated. The majority of the values of the quality statistic are between the two control limits, so no out-of-control signal is generated One value of the quality statistic falls outside the control limits, so no out-of-control signal is generated

Explanation / Answer

Correct answer: option (B)

since all values are lies between lower control limit 0.047 and Upper cotrol limit 0.0522

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