Life Tests Performed on a Sample of 13 Batteries of a New

question 4

Multiple Choice

Life tests performed on a sample of 13 batteries of a new model indicated: (1) an average life of 75 months, and (2) a standard deviation of 5 months.Other battery models, produced by similar processes, have normally distributed life spans.The 98% confidence interval for the population mean life of the new model is _________.

• A)63.37 to 86.63
• B)61.60 to 88.41
• C)71.77 to 78.23
• D)71.28 to 78.72
• E)79.86 to 81.28

---

Definitions:

Credibility

The quality of being trusted and believed in, often considered essential for individuals, businesses, and institutions in maintaining public confidence.

Business Planning

The process of creating a detailed plan on how a business will achieve its goals and objectives. It includes strategy development, resource allocation, and financial forecasting.

Strategic Planning

A process for defining a company's direction and making decisions on allocating its resources to pursue this strategy, including its capital and people.

Operational Planning

The process of planning short-term actions and strategies to achieve goals and objectives set by strategic planning.