The best method to show the association between height and weight of children in a class is by-: (A) Bar cha, (B) Line diagram, (C) Scatter diagram, (D) Histogram
Answer is C. - scatter maps show the relationship between two variables - if dots cluster round a straight line, it shows evidence of relationship of a linear nature. If there is no such cluster, it is probable that there is no relationship between the variables. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:847