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S

Stratified Sample

Where a population has been divided into strata based on common characteristics, a random sample drawn from each of the strata. Example: for the purposes of a school survey the pupils might be divided into age groups. The size of the sample drawn at random from each age group might be proportional to the relative sizes of the different age group for greater precision.

Surd

An expression including one or more square roots (or cube roots, fourth roots, etc.)

Surface

A set of points defining a space in two or three dimensions.

Symmetry

A plane figure has symmetry if it is invariant under (unchanged after) a reflection or rotation i.e. if the effect of the reflection or rotation is to produce an identical-looking figure in the same position. See also reflection symmetry, rotation symmetry. Adjective: symmetrical.

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