Example: 7.1 (Newbold) Price-earnings ratios for a random sample of
ten stocks traded on the NY Stock Exchange on a particular day were
10; 16; 5; 10; 12; 8; 4; 6; 5; 4
Use an unbiased estimation procedure to nd point estimates of the
following population parameters: mean, variance, proportion of values
exceeding 8.5.
x =
80
10
= 8
s2
x =
782