Harding Company produces precision blades used in the automotive industry. 20 samples of 5 blades each are sequentially selected from 500 blades produced on Monday. The mean of all sample means was 10.02 cm and the mean of the sample ranges was .032 cm. Determine the control limits for the sample means and sample ranges

Harding Company produces precision blades used in the automotive industry. 20 samples of 5 blades each are sequentially selected from 500 blades produced on Monday. The mean of all sample means was 10.02 cm and the mean of the sample ranges was .032 cm. Determine the control limits for the sample means and sample ranges

 

Solution

For sample mean, control limit is calculated by formula:-

UCL= (x–) + A2(R-) and LCL= (x–) – A2(R-)

where x– is mean of sample means=10.02cm,

A2= control

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