Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation o. Assume that the population has a normal distribution. Round the confidence interval limits to the same number of decimal places as the sample standard deviation. The mean replacement time for a random sample of 20 washing machines is 10.9 years and the standard deviation is 2.7 years. Construct a 99% confidence interval for the standard deviation, o, of the replacement times of all washing machines of this type. O 1.9 yr < o < 4.5 yr O 2.4 yr < a < 5.7 yr O 2.6 yr < a < 3.3 yr O 3.8 yr < o < 5.1 yr O 4.8 yr < a < 6.1 yr

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