week1.pdf - REVIEW OF BASIC STATISTICS By G\u00f6zdem Dural Sel\u00e7uk STATISTICAL INFERENCE Keywords \u2022 Population \u2022 Sample \u2022 Statistical inference

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REVIEW OF BASIC STATISTICS By Gözdem Dural Selçuk
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STATISTICAL INFERENCE Keywords: Population Sample Statistical inference
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POPULATION - SAMPLE What do we measure? VARIABLE (Examples?) Population Sample Parameter Statistic Keywords: Variable Parameter Statistic
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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.
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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.
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EXAMPLE Variable Hair color Experimental unit Person Typical Measurements Brown, black, blonde, etc.
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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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UNCERTAINTY!
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