Decide Whether or Not the Set Is Closed Under Addition

question 121

Multiple Choice

Decide whether or not the set is closed under addition.
-{0}

• A)Closed
• B)Not closed

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Definitions:

Observer Effect

The observer effect refers to changes that the act of observation can make on a phenomenon being observed.

Representative Sample

A subset of a population that accurately reflects the members of the entire population.

Volunteer Bias

The distortion of research results due to differences between those who choose to participate in studies and those who do not.

Representative Sample

A portion of the population that correctly mirrors the characteristics of the whole population.