Elementary Statistics and Computer Application

Scatter Diagram

• To investigate whether there is any relation between the variables X and Y we use scatter diagram. Let (x1,y1), (x2,y2)….(xn,yn) be n pairs of observations. If the variables X and Y are plotted along the X-axis and Y-axis respectively in the x-y plane of a graph sheet the resultant diagram of dots is known as scatter diagram. From the scatter diagram we can say whether there is any correlation between x and y and whether it is positive or negative or the correlation is linear or curvilinear.