In the Past,the Mean Running Time for a Certain Type

question 32

Multiple Choice

In the past,the mean running time for a certain type of flashlight battery has been 9.0 hours.The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has changed as a result.

• A)Two-sided
• B)Upper-tailed
• C)Lower-tailed

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Definitions:

Animal

A living organism that feeds on organic matter, typically having specialized sense organs and nervous system, and capable of voluntary movement.

Genus

A term in classification denoting a category of organisms sharing common characteristics, ranking above species and below family.

Furniture

Objects used to make a room or building suitable for living or working in, such as chairs, tables, and beds.

Tables

Pieces of furniture consisting of a flat top supported by one or more legs, used for various activities like eating, writing, or working.