The Principal of a Small Elementary School Wants to Select

question 105

Multiple Choice

The principal of a small elementary school wants to select a simple random sample of 24 students.
The school has 12 classrooms with 18 students in each class. She decides to randomly select two
Students from each classroom. Is this a simple random sample?

• A) No, because not all combinations of 24 students could have been chosen.
• B) Yes, because the students were selected at random.
• C) No, because each student did not have an equal chance of being selected.
• D) Yes, because a stratified sample is a type of simple random sample.
• E) Yes, because each student had an equal chance to be selected.

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Definitions:

Lone Pairs

Pairs of valence electrons that are not shared with another atom and do not participate in bonding, but significantly influence the shape and properties of molecules.

Lewis Structures

Diagrams that represent the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.

Molecular Formula

A notation that uses chemical symbols and numerical subscripts to represent the types and quantities of atoms in a molecule.

Valence

The combining capacity of an element or particle, often determined by the number of electrons that an atom can share, gain, or lose.