Math Problem Statement

The values listed below are waiting times​ (in minutes) of customers at two different banks. At Bank​ A, customers enter a single waiting line that feeds three teller windows. At Bank​ B, customers may enter any one of three different lines that have formed at three teller windows. Answer the following questions. Bank A 6.5 6.6 6.7 6.8 7.1 7.3 7.6 7.8 7.8 7.8

Bank Upper B 4.3 5.4 5.8 6.3 6.6 7.6 7.6 8.6 9.2 10.0 LOADING... Click the icon to view the table of​ Chi-Square critical values. Question content area bottom Part 1 Construct a 95​% confidence interval for the population standard deviation sigma at Bank A.    enter your response here minless thansigma Subscript Bank Upper Aless than    enter your response here min ​(Round to two decimal places as​ needed.)

Solution

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Math Problem Analysis

Mathematical Concepts

Statistics
Confidence Interval
Chi-Square Distribution

Formulas

Sample Standard Deviation: s = sqrt((Σ(x_i - x̄)^2) / (n - 1))
Confidence Interval for Standard Deviation: (sqrt((n-1) * s^2 / χ²_upper), sqrt((n-1) * s^2 / χ²_lower))

Theorems

Chi-Square Distribution

Suitable Grade Level

College/University Statistics