What Is the 90% Confidence Interval for the Variance of Exam

question 120

Multiple Choice

What is the 90% confidence interval for the variance of exam scores for 28 algebra students, if the standard deviation of their last exam was 12.7?

• A) \(108.6 < \sigma ^ { 2 } < 269.6\)
• B) \(10.4 < \sigma ^ { 2 } < 16.4\)
• C) \(123.7 < \sigma ^ { 2 } < 312.7\)
• D) \(122.8 < \sigma ^ { 2 } < 316.5\)

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