Normal Distribution Activity (in-class)
Practice Demo:
Suppose that 33 percent of women believe
in the existence of aliens. If 100 women
are selected at random, what is the
probability that more than 45 percent of
them will say that they believe in aliens?
SET UP:
Role #1: “100 women selected”
“45 percent of them”
Role #2:
p
ˆ
(
)
pp =
ˆ
µ
( )
n
pp
pSD )1(
ˆ−
=
Role #3:
(
)
=p
ˆ
µ
0.33
( )
≈
−
=100
)33.01(33.0
ˆ
pSD
0.047
Role #4:
p
ˆ
.19 .24 .28 .33 .38 .42 .47
