REVIEW OF BASIC STATISTICS By Gözdem Dural Selçuk
STATISTICAL INFERENCE Keywords: • Population • Sample • Statistical inference
POPULATION - SAMPLE • What do we measure? VARIABLE (Examples?) Population Sample Parameter Statistic Keywords: • Variable • Parameter • Statistic
VARIABLES AND DATA • A variable is a characteristic that changes or varies over time and/or for different individuals or objects under consideration. • Examples: Hair color, white blood cell count, time to failure of a computer component.
DEFINITIONS • An experimental unit is the individual or object on which a variable is measured. • A measurement results when a variable is actually measured on an experimental unit. • A set of measurements, called data, can be either a sample or a population.
EXAMPLE • Variable • Hair color • Experimental unit • Person • Typical Measurements • Brown, black, blonde, etc.
EXAMPLE • Variable • Time until a light bulb burns out • Experimental unit • Light bulb • Typical Measurements • 1500 hours, 1535.5 hours, etc.
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