ABSTRACT
Histograms show the distribution of a continuous variable in a diagram similar to a bar graph. They show the distribution of values over a range. The terms used to describe the patterns of histograms are as follows: Symmetric, skewed left, skewed right, bimodal, or multimodal. Histograms can be useful when analyzing data to better understand its distribution or "fluidity." The following are the steps to prepare a histogram: Calculate the range, divide the range of values into a series of intervals and count how many values fall into each interval. Make sure each interval is consecutive and adjacent. They are generally of equal size. It also include: Create a rectangle over each interval where the height represents the frequency are in each interval. Histograms are similar to bar charts and are sometimes confused with them. Histograms can be used for root cause analysis and is one of the essential quality control tools.
