Maths AI Statistics Sampling Methods

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9 Terms

1
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Simple Random Sampling

  • everyone has same chance

  • picking names from a pot

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Systematic sampling

  • selecting members of population at regular intervals

  • select every 10th file starting on 3rd

  • sample 5% systematically 5/100 = 1/20

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Convenience sampling

  • easiest to select or most likely to respond

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Stratified sampling

  • data divided into subgroups

  • from groups selected randomly

5
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Quota sampling

  • data divided in subgroups

  • specifically selected from subgroups (eg convenience)

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Positively skewed

  • median at lower end

  • data stretch to the right (high values)

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Negatively skewed

  • Median at higher end

  • data stretch to left (low values)

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Standard Deviation

  • measures spread of data

  • high = more spread

  • low = clustered around mean

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Variance

Standard deviation squared