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For a random sample of 23 European countries, the variance on life expetancey was 7.3 years. What is the 95% confidence interval for the variance of life expectancy in all of Europe? a. 272 < o2 < 118.3 b. 5.6 < 02 < 10.3 c. 4.4 < 02 < 14.6 d. 28.9 <2 < 115.0.

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