Four samples of each were taken from an assembly line with

Question

Four samples of 100 each were taken from an assembly line, with the following results:

Sample Number	Number Defective
1	6
2	12
3	2
4	8

Using the historical average as the central line of the chart, which one of the following is the limit for an attributes control chart with z = 2?

A) _{UCL > 0.1 and LCL > 0.03}

B) _{UCL > 0.1 and LCL < 0.03}

C) _{UCL < 0.1 and LCL > 0.03}

D) _{UCL < 0.1 and LCL < 0.03}

Answer

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