Random and Non-Random Sampling
- Created by: alicecaulfield
- Created on: 04-01-18 18:45
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- Sampling
- Random
- Sample sites are generated randomly using a random number generator
- Advantages
- Data will be unbiased
- Disadvantages
- May not cover all areas of the habitat equally
- Non-Random
- opportunistic
- Researcher has made sampling decisions based on prior knowledge
- Advantages
- easier and quicker than non random sampling
- Disadvantages
- Data may be biased
- Stratified
- Advantages
- Ensures that all species are not underrepresented as different areas are sampled
- Disadvantages
- May lead to over representation of a species
- Divide habitat into sections that are different
- Advantages
- Systenatic
- Samples are taken at fixed intervals e.g belt transects and line transects
- Advantages
- Useful when a habitat shows an environmental gradient
- Disadvantages
- Species may be missed as the species that are on a line or belt transect will be recorded
- opportunistic
- Random
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