Confidence Interval for Varaince & Standard Deviation
Not what you're looking for?
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
Purchase this Solution
Solution Summary
The solution provides step by step method for the calculation of confidence interval for variance and standard deviation. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.
Purchase this Solution
Free BrainMass Quizzes
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.