Random sampling

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4 Terms

1
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Define interspecific variation

  • One specifies differs from another


2
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Define intraspecific variation

  • Members of same specifies differ from each other


3
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Give 2 reasons why sampling may not be representative

  • Sampling bias - investigators may be making unrepresentative choices

  • Chance - Individuals chosen may be pure chance, not be representative


4
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Describe random sampling

  1. Divide study area into a grid of numbered lines

  2. Using random numbers from a table or generated by a computer to obtain a series of coordinates

  3. Take samples at the intersection of each pair of coordinates