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.