说明：  906 求一元线形回归方程及预报 一 功能 x为自变量，y为随机变量，给出一组n次观测值（Xi, Yi）, I=1, 2, … n, 求线形回归方程 Y=A+BX 来描述Y与X的变化规律。并用T检验法检验线形回归是否显著。若显著，可用求得的线形回归方程作预报，并给出预报值的置信区间。
(906 for one yuan linear regression equation and forecast a function of the variable x, y as random variables, is a group of n measurements (Xi, Yi), I = 1, 2, ... n, seeking linear regression equation Y = A BX to describe the X and Y changes in the law. Using T-test whether linear regression significantly. If significant, can be used to compute the linear regression equation for forecasting, and is forecasting value of the confidence interval.)