Casio ALGEBRA FX 2.0 Examples Manual page 9

Example The County Clerk wishes to improve voter registration. One method
under consideration is to send reminders in the mail to all citizens in
the county who are eligible to register. As a pilot study to determine if
this method will actually improve voter registration, a random sample
of 1224 potential voters was taken. Then this sample was randomly
divided into two groups.
Group A
Group B
The County Clerk claims that the proportion of people to register was
significantly greater in group B. On the basis of this claim the clerk
recommends that the project be funded for the entire population of
Macek County. Use 5% level of significance to test the claim that the
proportion of potential voters who registered was greater in group B,
the group that received reminders.
Procedure
1 m STAT2
2 3(TEST) b(Z)e(2-Prop)
3 2(<) c
ciaw
gbcw
ddfw
gbcw
1(None) c
4 1(CALC)
6(DRAW)
Result Screen
Since P = 8.3277e-4 < 0.05 (level of significance), we can reject the null hypothesis (P
and conclude that the County Clerk's claim is valid at the 0.05 level of significance.
9
examples
: There were 612 people in this group. No reminders to
register were sent to them. The number of potential
voters from this group who registered was 280.
: This group also contained 612 people. Reminders were
sent in the mail to each member in the group, and the
number who registered to vote was 335.
>P
)
1 2