Confidence Interval for a Population Mean
AP Statistics · Flashcards
AP STATISTICS · FLASHCARDS
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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
.
QUESTION
How does variability affect the confidence interval?
QUESTION
What happens to the interval if sample standard deviation decreases?
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ANSWER
The interval becomes narrower. Smaller
s
s
s
reduces standard error and margin of error.
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