Concept:A scatter diagram shows the pattern of relationship but does not provide a numerical measure of correlation.Explanation:Statement A is true because a scatter diagram only gives a visual approximate idea of the relationship; it cannot measure the exact extent or strength of correlation.Statements B and C are false because a scatter diagram does not "measure" correlation at all—it merely displays the data points, regardless of linearity.Since A is true, option D ("None of these") is false.Answer:Option A is the statement that is not false.