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1. A sample of 23 European countries found that the variance of life expectancy was 7.3 years. What is the 95% confidence interval estimate for the variance of life expectancy in Europe?

A) 27.2 < Ï?2 < 118.3

B)5.6<Ï?2 <10.3

C)4.4<Ï?2 <14.6

D) 28.9 < Ï?2 < 115.0

________________

2. Find the 95% confidence interval for the standard deviation of the lengths of pipes if a sample of 26 pipes has a standard deviation of 10 inches.

A) 14.0 < Ï? < 16.0

B) 7.8 < Ï? < 13.8

C) 74.0 < Ï? < 126.0

D) 60.8 < Ï? < 190.5

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Category:- Statistics and Probability
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