Math Problem Statement

Use the given information to find the number of degrees of​ freedom, the critical values chi Subscript Upper L Superscript 2 and chi Subscript Upper R Superscript 2​, and the confidence interval estimate of sigma. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 90​% ​confidence; nequals25​, sequals0.28 mg. LOADING... Click the icon to view the table of​ Chi-Square critical values. Question content area bottom Part 1 dfequals

enter your response here ​(Type a whole​ number.)

Solution

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Math Problem Analysis

Mathematical Concepts

Statistics
Confidence Interval
Chi-Square Distribution

Formulas

df = n - 1
CI for σ: (√((n-1) * s² / χ²_R), √((n-1) * s² / χ²_L))

Theorems

Chi-Square Distribution
Confidence Interval Theorem

Suitable Grade Level

College Level Statistics