Understand Q-Q Plot and Normal Distribution Statistics

Engineers and scientists work with data. Without data, they are not able to draw any conclusion. Now is the era of creation of data everyday from every aspects of our lives. Some data are random and some are biased. Some may suffer from bias because of the data collection process. One very important aspect of data is the distribution profile. The collected data may have normal distribution or may be far from normal. It may also be skewed one either side or may follow multimodal pattern. It may be discrete or may be continuous. For continuous data, normal distribution brings a whole lot of advantages compared to its counterparts. Various inferential statistical process assume that the distribution is normal. A bell-shaped curve is easy to describe with mean and standard deviation.