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Confidence interval for the population variance

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Let x represent the number of mountain climbers killed each year. The long-term variance of x is approximately σ2 = 136.2. Suppose that for the past 12 years, the variance has been s2 = 114.8. Use a 1% level of significance to test the claim that the recent variance for number of mountain-climber deaths is less than 136.2. Find a 90% confidence interval for the population variance.

Find the value of the chi-square statistic for the sample.

What are the degrees of freedom?

Find or estimate the P-value of the sample test statistic.

Reference no: EM132168180

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