Why is the sample correlation coefficient of this group of sample data 1 in the third question of liberal arts mathematics, the new national college entrance examination standard in 20 12? Want to analyze it in detail. This part is mentioned in the reading and thinking of pages 3 and 92 of the compulsory textbook of the new curriculum standard. In statistics, correlation coefficient R is used to measure the strength of linear relationship between two variables. A positive R indicates a positive correlation between two variables, and a negative R indicates a negative correlation between two variables. The closer the absolute value of r is to 1, the stronger the correlation is. All the points in this problem are on the same straight line, and the linear relationship is the strongest, and it is positive correlation, so the correlation coefficient is 1.