GCSE Maths (Edexcel)
435 videos | 33 hours
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Statistics
Statistics
Good & Bad Samples
5:19
Sampling
Spec
S1
S5
- A good sample accurately reflects the characteristics of a population
- A sample is a group taken from a population that is easier to survey
- Biased samples occur when certain characteristics are more likely to be selected
- Biased samples can lead to incorrect conclusions about the population
- Randomly choosing people or items from the population greatly reduces bias in a sample
- Larger samples more accurately represent the population
- Larger samples reduce bias by including low represented characteristics in the correct proportion
- Larger samples are more difficult and expensive to survey
- Survey size is usually a compromise between quality and cost
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