The Mean Replacement Time for a Random Sample of 12 $$\sigma ^ { 2 }$$

question 87

Multiple Choice

The mean replacement time for a random sample of 12 cd players is 8.6 years with a standard deviation of 3.5years. Construct the 98% confidence interval for the population variance, $$\sigma ^ { 2 }$$ . Assume the data are normallydistributed

• A) (5.4, 44.1)
• B) (2.3, 6.6)
• C) (1.6, 12.6)
• D) (5.1, 37.7)

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