Confidence Interval for a Population Mean
AP Statistics · Flashcards · Application
AP STATISTICS · FLASHCARDS
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QUESTION
Find the degrees of freedom for
n
=
15
n = 15
n
=
15
.
QUESTION
Find
t
∗
t^*
t
∗
for
d
f
=
10
df = 10
df
=
10
at 95% confidence level.
QUESTION
Find the 95% confidence interval:
x
ˉ
=
10
\bar{x} = 10
x
ˉ
=
10
,
t
∗
=
2
t^* = 2
t
∗
=
2
,
s
=
5
s = 5
s
=
5
,
n
=
25
n = 25
n
=
25
.
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ANSWER
10
±
2
10 \pm 2
10
±
2
. Margin of error is
2
×
5
25
=
2
×
1
=
2
2 \times \frac{5}{\sqrt{25}} = 2 \times 1 = 2
2
×
25
5
=
2
×
1
=
2
.
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