GAT Subject Statistics MCQs

A discrete variable takes countable values, usually integers.
The number of students cannot meaningfully take fractional values.

The data are already ordered and contain five values.
The third value is the median, so the answer is 7.

Continuous variables can take any value within an interval.
Weight can be measured to increasingly fine precision.

With four ordered observations, average the two middle values.
The median is (4 + 8) ÷ 2 = 6.

Nominal data classify observations without ranking them.
Examples include blood group and marital status.

Ordinal data preserve order among categories.
The gaps between successive categories need not be equal.

Interval scales support meaningful differences between values.
Temperature in degrees Celsius has no true absence point.

Ratio-scale data support meaningful ratios because zero represents absence.
Weight, distance, and age are common examples.

A frequency distribution organizes data by values or class intervals.
It helps reveal concentration, spread, and shape.

A histogram uses adjacent bars to display frequencies across intervals.
The touching bars reflect continuity of the measurement scale.

Histograms represent continuous intervals and normally use touching bars.
Bar charts display separate categories with gaps.

The median depends on order rather than the magnitude of all observations.
Extreme values can greatly affect the mean but often leave the median stable.