A Statistician Knows That the Population of Light Bulb Lifetimes

question 37

Essay

A statistician knows that the population of light bulb lifetimes is normally distributed and has a standard deviation of 30 hours. A simple random sample of 36 bulbs yields a mean lifetime of 504 hours.
Construct a 99% confidence interval for the mean lifetime of all such bulbs.
______________
Interpret the interval.
________________________________________________________

---

Definitions:

Floral Bouquets

An arrangement of flowers, typically designed and wrapped for decorative or gifting purposes.

Plantwide Overhead Rate

A single overhead absorption rate used throughout an entire plant or factory, applied to all production units equally.

Activity-based Costing

A costing method that allocates overhead costs to specific activities, providing more accurate product costing.

Activity-based Costing

A method of costing that identifies individual activities as fundamental cost objects and assigns costs to them based on their use of resources.