10.5.1 Unbiased estimates In the example 10.1 ·the sample mean Unbiased i)2y· m i= ·The sample variance 6=12(y-) m i=l UESTC 99 UESTC 10.5.1 Unbiased estimates In the example 10.1 • the sample mean • The sample variance ( ) 1 1 ˆ=ˆ m i m i=  α y y =  Unbiased ( ) 2 2 1 1 ˆ ˆ m i m i   = = −  y