<prompt> Graph to compare two quantitative data is?HistogramScatter diagramLine DiagramFrequency curve  <response>: - 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 : Parks textbook of preventive and social medicine, 23rd edition, pg no:847 