Confidence interval for the variance of life expectancy
A sample of 23 European countries found that the variance on life expectancy was 7.3 years. What is the 95% confidence interval for the variance of life expectancy in Europe?
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If we wish to be 95% certain of avoiding a Type I error, use these data to examine differences in the average distance traveled to the two clinics.
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The distribution of Plan B subscribers is also positively skewed, but not as severely. The coefficient of skewness is 1.54. At the .05 significance level, is it reasonable to conclude the mean income of those selecting Plan B is larger? What is th
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