Standard Error for sample mean estimation of the population mean:
(x i x ) 2 /(n 1)
Standard Error for sample proportion estimation of the population proportion:
Standard Error for sample slope estimation of population slope coefficients:
(For k=2 independent variables)
x1 )2 (1 r12 ) n 2 1
How can we make our common-sized error smaller when estimating slopes?
C: r 12 is the correlation between our two independent variables