When "defects" are being counted with a consistent sample size, which chart is appropriate?

In scenarios where "defects" are being counted with a consistent sample size, a c-Chart is the appropriate choice. This chart is specifically designed to monitor the number of defects in a fixed unit of measurement. The c-Chart is particularly useful when dealing with count data, where you are interested in the total number of defects found in each sample.

The nature of the c-Chart allows for the tracking of the defect count over time, enabling analysts to identify trends or shifts in the process. It operates under the assumption that the opportunity for defects remains constant across the samples, which aligns perfectly with the condition of having a consistent sample size.

Other options, such as the np-Chart and P-Chart, focus on the number of nonconforming items or the proportion of defective items, and the u-Chart is suitable for cases where the sample size varies, as it accounts for the number of defects per unit of measurement. Therefore, their use would not be appropriate in this specific case where the sample size remains the same.