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

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)