Defective light bulbs data

A quality engineer assesses whether the process used to manufacture light bulbs is in control. The engineer tests 500 light bulbs each hour for three 8-hour shifts and records the number of bulbs that did not light (defectives).

Because the data are counts of defectives, you can use this data to demonstrate NP Chart.

Worksheet column Description
Subgroup ID The subgroup identification number
Defectives The number of light bulbs that did not light in the subgroup
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