Key Concepts Unit 2 - Key Concepts for Unit 2 Percentage...

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Key Concepts for Unit 2 Percentage change: the relative change in the value of a variable from one sample to the next; the percentage change may be large, but that doesn’t necessarily mean that the value of the variable changed much in absolute terms: Percentagechange=newvalue−originalvalue× 100% Polling bias: when the results of a poll are biased because of sampling problems or the use of leading questions; can be accidental or intentional Small sample bias: a form of bias caused by the chance inclusion of extreme data values in a small sample; these extreme values will have a large effect on the overall pattern, potentially causing results far different from those you would see in a larger sample from the same population Hidden sampling patterns: a potential form of bias that
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