Casio ALGEBRA FX2.0 Advanced Statistics Examples 2 - Manual (Page 8)

33
examples
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Example If 132 of 200 male voters and 90 of 150 female voters favor a certain
candidate running for governor of Texas, find a 99% confidence
interval for the difference between the actual proportions of male and
female voters who favor the candidate.
Procedure
1 m STAT2
2 4 (INTR) b (Z) e (2-Prop)
3 .jj w
bdc w
caa w
ja w
bfa w
1 (None) c
4 1 (CALC)
Result Screen
Let p
1
the actual propotion of male voters who favor the candidate.
Let p
2
the actual propotion of female voters who favor the candidate.
Thus, the 99% confidence interval for (p
1
-p
2
) is -0.074<p
1
-p
2
<0.194.