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Which of the following is a 98% confidence interval for the population variance when the sample variance is 20 for a sample of 10 items

Which of the following is a 98% confidence interval for the population variance when the sample variance is 20 for a sample of 10 items from a normal population?

[8.308, 86.207][7.476, 77.512][8.617, 78.125]

[7.755, 70.313]

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