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A sample of 23 European countries found that the variance of life expectancy was 7.3 years. What is the 95% confidence interval for the variance of life expectancy in Europe.

a. 4.7 < o2 < 13
b. 27.2 < o2 < 118.3
c. 28.9 < o2 < 115.0
d. 5.6 < o2 < 10.3

o 2 is to the 2nd power

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