Which of the Following Yields a Cluster Sample

question 81

Multiple Choice

Which of the following yields a cluster sample?

• A)All students in a class are divided into groups of 15.One student is randomly chosen from the 1st group, the remaining observations are every 15th student thereafter.
• B)The best 15 students, according to the opinion of the instructor, in a class are selected.
• C)All students in a class are grouped according to their gender.A random sample of 8 is selected from the males and a separate random sample of 7 is selected from the
• Females.
• D)All students in a class are divided into groups according to the rows that they are seated.One of the groups is randomly selected.

---

Definitions:

Hydrogen Ion Concentration

A measure of the acidity or alkalinity of a solution, denoted by pH, which corresponds to the negative logarithm of the concentration of hydrogen ions in the solution.

pH

A measure of the acidity or alkalinity of an aqueous solution, ranging from 0 to 14.

Half-Life

The time required for a quantity to reduce to half its initial value, often used in physics and chemistry to describe radioactive decay.

Radioactive Plutonium

A highly radioactive chemical element with the symbol Pu and atomic number 94, used as a fuel in nuclear reactors and in the production of nuclear weapons.