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For a random sample of 23 Asian countries, the variance on life expectancy was 7.3 years. What is the 95% confidence interval for the variance of life expectancy in all of Asia?

Show me step by step how to solve this problem. What identifies the equation to use?

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n = 23

Degrees of freedom = 23 - 1 = 22

s^2 = 7.3

α = 0.05

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