Sample linear regression model 简单线性相关模型 bo+bX Predicted Value of y for observation i X = Value of X for observation i bo =Sample y-intercept used as estimate of the population Bo b,=Sample Slope used as estimate of the population BISample Linear Regression Model 简单线性相关模型 Y i = b 0 + b 1 X i  Yi  = Predicted Value of Y for observation i Xi = Value of X for observation i b0 = Sample Y - intercept used as estimate of the population 0 b1 = Sample Slope used as estimate of the population 1