A plant conducts final inspection on samples of 10 automobile radios selected at random. A summary of the most recent 30 samples is shown below.

a. If the number of radios in a sample is reduced from 10 to 5 what impact does this have on the control chart (i.e., the centerline and control limits)?
b. Construct an appropriate control chart and comment on whether this process is in statistical control.

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Sample No. of SampleNo. of SampleNo. of No Defect No Defe cts No 21 Defects 23 2 26 15 20 12 13 14 15 16 17 18 17 23 24 25 26 27 28 29 30 4 18 13 14 25 12 18 26 27 26 24 20 27