SL CT Chapter 11: Sampling and Data Notes
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Last updated 1:27 AM on 9/14/23
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11 Terms
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Sampling Error
Occurs when a characteristic of a sample differs from the population. The error is random and will occur even for samples which are well chosen.
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Coverage Error
Occurs when a sample does not truly reflect the population. Avoided by having a large and unbiased sample.
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Non-response Error
Occurs when a large number of people do not respond.
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Measurement Error
Inaccuracies in measurement at the data collection stage.
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Simple Random Sampling
Drawing names, random number generators, etc.
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Systematic Sampling
Selecting members of the population at regular intervals
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Convenience Sampling
Selecting members because they are easier to access.
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Stratified and Quota Sampling
Useful when the population can be divided into subgroups. You divide into subgroups and choose from each group to get an even result.
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Categorical Data
Describes a quality or characteristic.
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Discrete
Take exact number values (usually from counting)
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Continuous
Can take any numerical value from a certain range (usually from measuring)
