Calculate

the

variance

and

the

stan

-

dard

deviation

of

U.S.

Treasury

bills,

long-term government

bonds,

and

small-company

stocks

for

1950

to

1959, 1960

to

1969, 1970

to

1979,

and

1980

to

1989

from

Table

8.1. Which

had

the

highest variance? Which

had

the

lowest variance?

Hint

:

Use

a spreadsheet