A Study Is Under Way in Yosemite National Forest to Determine

question 137

Multiple Choice

A study is under way in Yosemite National Forest to determine the adult height of American pine trees.Specifically,the study is attempting to determine what factors aid a tree in reaching heights greater than 60 feet tall.It is estimated that the forest contains 25,000 adult American pines.The study involves collecting heights from 250 randomly selected adult American pine trees and analyzing the results.Identify the population from which the study was sampled.

• A)The 250 randomly selected adult American pine trees.
• B)The 25,000 adult American pine trees in the forest.
• C)All the adult American pine trees taller than 60 feet.
• D)All American pine trees,of any age,in the forest.

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Definitions:

Pushbutton Interlocking

A control system feature that prevents the actuation of a device until certain conditions are met, often using pushbuttons for initiation.

Electrical Interlocking Circuit

A safety mechanism in electrical engineering designed to prevent dangerous combinations of actions by controlling the sequence of operations.

Pilot Light

An indicator light used on control panels or equipment to indicate operational status or to highlight warnings to the operator.

Thermocouples

Devices that measure temperature based on the voltage generated at the junction of two different metals.