A canning company defines a "nonconformance" as an orange juice can whose diameter is beyond the upper specification limit. A manager at the canning company wants to monitor the number of such orange juice cans produced per day. Each day, an employee will randomly select 120 cans over a period of four weeks. The employee then determines and plots the number of nonconformance cans in each sample. The appropriate control chart is a(n):.
A) u-chart.
B) R-chart.
C) p-chart.
D) np-chart.

Option D. np-chart.

Explanation:

An np-chart is an attributes control chart which is used with the data that is collected in subgroups that are the same size. Np-charts are used to show how the process (which is measured by the number of nonconforming items it produces) changes over time. The process attribute is always described in a yes/no, pass/fail, go/no go form.

In other words, an np-chart refers to a plot of number of defective pieces in a fixed sample size in the order of production. If the sample size is fixed, np-chart can be used. For instance, the number of incomplete accident reports in a constant daily sample of five would be plotted on an np-chart.

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