The Mean Replacement Time for a Random Sample of 12 $8.6$

question 110

Multiple Choice

The mean replacement time for a random sample of 12 CD players is $8.6$ years with a standard deviation of $4.4$ years. Construct the $99 \%$ confidence interval for the population variance, $\sigma ^ { 2 }$ . Assume the data are normally distributed, and round to the nearest hundredth when necessary.

• A) \(( 1.81,18.59 )\)
• B) \(( 2.82,9.04 )\)
• C) \(( 7.96,81.81 )\)
• D) \(( 8.61,69.74 )\)

---

Definitions:

Agricultural Regions

Geographic areas known for a predominant focus on agriculture and farming activities.

Ownership of Land

Holding legal title or claim to a piece of ground, including the right to use, control, and transfer the land.

Republican Party

One of the two major political parties in the United States, traditionally emphasizing free market policies, limited government, and conservative social values.

Southern States

The states in the southeastern and south-central United States, historically known for their agricultural economy and being pro-slavery before the Civil War.