If you are counting defectives with a constant sample size, which chart would you utilize?

The np-Chart is the correct choice for counting defectives when you have a constant sample size. This type of control chart is specifically designed to monitor the number of items in a sample that are defective and is particularly effective when the sample size remains unchanged throughout the process.

In a situation where the sample size is constant, the np-Chart provides a clear and straightforward representation of the proportion of defectives in the samples. It plots the number of defectives rather than the proportion of defectives, making it easier to interpret for cases where the sample size does not fluctuate.

Other options like the c-Chart and u-Chart are more appropriate for counting defects per unit rather than defectives per unit, while the p-Chart tracks proportions and requires varying sample sizes. Thus, for consistent sample sizes and straightforward count of defectives, the np-Chart is the optimal choice.