![]() There is line called upper control limit and line below central line is lower control line. In control chart There is central line which is average and above central line.This gives the idea about the variation and tell which variations to control and how?.The relationship between X and Y can be linear, curvilinear, exponential, logarithmic, quadratic, polynomial.The graph plotted considering dependent variables on Y – Axis and Independent Variable on X – axis.Scatter Diagram shows the relationships between factors which are taken for evaluation.We can assess how the variation looks like.Histogram shows the variation in the data in graphical form. ![]()
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