Confidence Intervals: Difference of Two Proportions
AP Statistics · Flashcards · Application
AP STATISTICS · FLASHCARDS
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QUESTION
Calculate the confidence interval width for
p
1
=
0.7
p_1 = 0.7
p
1
=
0.7
,
p
2
=
0.5
p_2 = 0.5
p
2
=
0.5
,
n
1
=
80
n_1 = 80
n
1
=
80
,
n
2
=
90
n_2 = 90
n
2
=
90
.
QUESTION
Given
p
1
=
0.3
p_1 = 0.3
p
1
=
0.3
,
p
2
=
0.5
p_2 = 0.5
p
2
=
0.5
,
n
1
=
100
n_1 = 100
n
1
=
100
,
n
2
=
120
n_2 = 120
n
2
=
120
, calculate the standard error.
QUESTION
Find the value of
x
2
x_2
x
2
for
p
2
=
0.3
p_2 = 0.3
p
2
=
0.3
and
n
2
=
200
n_2 = 200
n
2
=
200
.
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ANSWER
x
2
=
0.3
×
200
=
60
x_2 = 0.3 \times 200 = 60
x
2
=
0.3
×
200
=
60
. Number of successes equals proportion times sample size.
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