A Researcher Randomly Selected 10 Census Tracts from a Metropolitan

question 49

Multiple Choice

A researcher randomly selected 10 census tracts from a metropolitan area.Within each census tract,30 households were randomly selected.The sampling technique just described would be a ______________.

• A)quota sample
• B)area cluster
• C)stratified random
• D)systematic random
• E)systematic quota

---

Definitions:

Ethanol

A volatile, flammable, colorless liquid alcohol, widely used as a solvent, in medicine, and as the intoxicating ingredient in alcoholic beverages.

Substitution Reaction

A chemical reaction in which an atom or group of atoms in a molecule is replaced by another atom or group of atoms.

Mechanism

The detailed process by which a chemical reaction occurs, at the level of molecular structure.

Protic Solvents

Solvents that have hydrogen atoms capable of forming hydrogen bonds, often used in reactions requiring proton transfer.