Question: A statistical process control (SPC) chart plots the sample output (obtained at a certain point in time) against the upper and lower control limits, UCL

A statistical process control (SPC) chart plots the sample output (obtained at a certain point in time) against the upper and lower control limits, UCL and LCL (these are the upper and lower dotted lines in the figure below). The figure below shows the sample output at 9 am, 10 am, ..., through 4 pm. Which of the samples suggests the process is "out of control?"

A statistical process control (SPC) chart plots

Group of answer choices

The samples at 10 am, 12 pm, 1 pm, 2 pm, and 3 pm

The samples at 9 am and 11 am and 4 pm

Only the sample at 4 pm

Only the samples at 9 am and 11 am

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