Chapter 2

# Chapter 2 - Chapter Two The Language of Statistics...

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Chapter Two: The Language of Statistics Population – everything you wish to study Variable – used to represent a characteristic of each member of the population Sample – piece of the population Why pick a sample? It would take too much time to study the entire population. It would take too much money to study the entire population. It might not be possible to identify all the members of the population. If we test the entire population we might not have anything left to sell. Census – study of the entire population Sampling Error – difference between a characteristic of the entire population and a sample of that population Size of sampling error is determined by two factors: Size of sample Amount of variation that exists in population Variation – how different the members of the population are from each other with regard to the variable being studied. Parameter – number that describes a characteristic of the population We need numbers to describe the behavior of the sample for two reasons:

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Chapter 2 - Chapter Two The Language of Statistics...

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