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Q

Quadrant

One of the four regions into which a plane is divided by the x and y axes in the Cartesian co-ordinate system.

Quadrilateral

A polygon with four sides.

Qualitative

Relating to a quality or attribute. Used as an adjective to describe conclusions and explanations that use mostly words as opposed to numbers and equations (quantitative).

Quantitative

Relating to a quantity or number. Used as an adjective to describe conclusions and explanations that use mostly numbers and equations as opposed to words (qualitative).

Quartile

Where quantitative data is ranked in ascending order, the three quartile values (first, second and third) divide the data into four equal parts.  The difference between the first and third quartiles, used as a measure of spread, is the interquartile range. The second quartile is also the median value.

Quotient

Another word for the result of a division. Example: 5 is the quotient of 100/20. The number being divided, in this case 100, is sometimes known as the dividend.