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20 Cards in this Set
- Front
- Back
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Definition of sampling? |
Taking measurements of individuals selected from the population of organisms which is being investigated. |
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What does sampling bias mean? |
The selection may be bias because the investigators may be making unrepresentative choices, either deliberately or unwillingly. |
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What does chance mean? |
If sampling bias is avoided the individuals chosen may be by pure chance, not be representative. E.g the 50 chosen buttercups by chance may be the tallest buttercups in the sample. |
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What is the best way to prevent sampling bias? |
The best way to prevent sampling bias it to eliminate as much human involvement as far as possible. |
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Explain the method of random sampling? |
1. divide study area in to a grid of numbered lines by stretching 2 tape measures at right angles to each other. 2. Using random numbers from a table or generated by a computer obtain a scene of coordinates. 3. Take samples at intersections of each coordinates. |
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What is meant by larger sample size? |
The more individuals that are selected the smaller the probability that chance will influence the result. |
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What is meant by larger sample size? |
The more individuals that are selected the smaller the probability that chance will influence the result. |
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Name the causes of variation? |
Genetic differences: mutations, meiosis, fusion of gametes.
Environmental influences: usually a combination of both causing variation. |
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What is meant by larger sample size? |
The more individuals that are selected the smaller the probability that chance will influence the result. |
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Name the causes of variation? |
Genetic differences: mutations, meiosis, fusion of gametes.
Environmental influences: usually a combination of both causing variation. |
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What does a large standard deviation mean? |
Means a lot of variety |
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What is meant by larger sample size? |
The more individuals that are selected the smaller the probability that chance will influence the result. |
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Name the causes of variation? |
Genetic differences: mutations, meiosis, fusion of gametes.
Environmental influences: usually a combination of both causing variation. |
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What does a large standard deviation mean? |
Means a lot of variety |
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What does small standard deviation mean? |
Means little variety. |
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What is meant by larger sample size? |
The more individuals that are selected the smaller the probability that chance will influence the result. |
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Name the causes of variation? |
Genetic differences: mutations, meiosis, fusion of gametes.
Environmental influences: usually a combination of both causing variation. |
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What does a large standard deviation mean? |
Means a lot of variety |
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What does small standard deviation mean? |
Means little variety. |
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What does interspecific variation mean? |
Variation within a species |
