Use the One-Standard-Deviation Chi-Square Interval Procedure to Obtain the Specified $10.8$

question 81

Multiple Choice

Use the one-standard-deviation chi-square interval procedure to obtain the specified confidence interval for thepopulation standard deviation Ϭ. Assume that the population has a normal distribution.
-The mean replacement time for a random sample of 20 washing machines is $10.8$ years and the standard deviation is $2.7$ years. Construct a $99 \%$ confidence interval for the standard deviation, $\sigma$ , of the replacement times of all washing machines of this type.

• A)\(1.8\) to \(5.1 \mathrm { yr }\)
• B) \(1.9\) to \(5.7 \mathrm { yr }\)
• C) \(2.0\) to \(4.3 \mathrm { yr }\)
• D) \(1.9\) to \(4.5 \mathrm { yr }\)

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