Question

What is a histogram? Describe its use and benefit in a quality control system

Answer 1

A Histogram is the graphical representation of data using bars of different ranges(heights). It looks similar to a bar chart. But, histogram groups the data in to different ranges. It was first used by 'Karl Pearson'.

Uses and benefits of a Histogram in quality control system may be as follows:-

• Histogram is widely used to study the performance of a process. Hence, it is considered as a powerful tool for quality control.
• It helps to better visualisation of the dataset.
• It helps to identify different frequency and categories of the dataset.
• A histogram helps to identify trend.
• It helps to understand the skewness of the data processed.
• A histogram is used to analyse causes of poor performance in a quality control system. It helps to take preventive and remedial actions.