Math Problem Statement
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Solution
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Math Problem Analysis
Mathematical Concepts
Statistics
Confidence Interval
Variance
Chi-square Distribution
Formulas
Weighted Mean: \(\bar{x} = \frac{\sum (x_i \cdot f_i)}{\sum f_i}\)
Weighted Variance: \(\sigma^2 = \frac{\sum f_i (x_i - \bar{x})^2}{\sum f_i}\)
Confidence Interval for Variance: \(\left( \frac{(n-1)S^2}{\chi^2_{\alpha/2}}, \frac{(n-1)S^2}{\chi^2_{1-\alpha/2}} \right)\)
Theorems
Chi-square Distribution for Confidence Intervals
Suitable Grade Level
Undergraduate Statistics
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