Ch03 - Parametervs.Statistic POPULATION Parameter: Unknown

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1 Chapter 3 Parameter vs. Statistic Parameter vs. Statistic Parameter:  Unknown  Fixed if pop stays same  N items Statistic:  Estimate for the parameter  Changes from sample to sample  n items POPULATION SAMPLE
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2 Chapter 3 Types of Samples Types of Samples Simple Random Sample  Simple Random Sample  (RANDBETWEEN(1,70)) (RANDBETWEEN(1,70)) Reduces bias Reduces bias Stratified Sample Stratified Sample SRS from  SRS from  strata strata  or similar groups within a   or similar groups within a  population population Cluster Sample Cluster Sample Geographical regions to define strata Geographical regions to define strata
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3 Chapter 3 Nonrandom sample methods Nonrandom sample methods Judgment Sample Judgment Sample Convenience Sample Convenience Sample Both can lead to bias and should be avoided Both can lead to bias and should be avoided
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Chapter 3 4 Chapter 3 Describing Data Visually
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5 What are we looking for? We look for:
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Ch03 - Parametervs.Statistic POPULATION Parameter: Unknown

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