LI Unbiased point estimates Population Sample Parameter Statistic Formula o mean, X x 2=2 n-x 2 Variance, o 12 Proportion,兀 p=x Successes n trials o 2002 The Wadsworth GroupUnbiased Point Estimates Population Sample Parameter Statistic Formula • Mean, µ • Variance, s 2 • Proportion, p x x = x  i n –1 ( – )2 2 2 n x i x s s = p p = x successes n trials © 2002 The Wadsworth Group