GAT Subject Statistics MCQs

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.

A population contains every unit about which conclusions are desired.
A sample is selected from the population for practical study.

A sample provides information about a larger population.
Good sampling methods aim to make it representative.

Parameters describe populations, such as a population mean or proportion.
They are often unknown and estimated using sample statistics.

A statistic summarizes observed sample data.
It may be used to estimate a corresponding population parameter.

Qualitative variables describe categories rather than numerical amounts.
Blood groups such as A, B, AB, and O are categories.