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Example:
n = 10 so df = 10 – 1 = 9
Use table A-4 to find:
  2.700
2
L
and
  19.023
2
R
Construct the confidence interval: n = 10, s = 0.15
n  1s

2

2
R
10  10.15 
2

2
19.023
n  1s


2
2
L
10  10.15 


2

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2
2.700
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