Which one of the following Control Charts would be used to monitor Attribute Data?

The p Chart is specifically designed for monitoring attribute data, which represents qualitative outcomes that can be classified as "defective" or "non-defective" (pass/fail) rather than measuring a quantitative variable. This type of chart is used to assess the proportion of items in a sample that fall into a particular category, making it ideal for situations where the quality of a product or process is being evaluated based on yes/no criteria.

In contrast, the X-bar and S Chart, as well as the X-bar and R Chart, are used for variables data, which consist of measurements on a continuous scale (e.g., length, weight, time). These charts help monitor the mean and variability of a process based on numerical data, thus not suitable for attribute measurements.

The g Chart is also used for variable data, particularly for monitoring count data where the events occur over time or in a fixed unit of measure. This further differentiates it from the p Chart, which is focused on proportion data instead. Therefore, the p Chart is the correct choice for monitoring attribute data as it directly aligns with the type of information being measured.