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Title: AQA AS BIOLOGY QUANTITATIVE INVESTIGATION
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
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If one species differs from another this is called interspecific We cannot completely remove chance from the samvariation
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So how do we meas- 1
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Biologists have to take many measurements of the same
thing as they are usually measuring some aspect of living
organisms and all of these are different
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In theory, if these individuals are representative of the population as a whole, then the measurements can be relied upon
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Analysis of the data collected
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Quantitative investigations of variation
The normal distribution curve:
A bell shaped curve
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The mean: sum of sampled values divided by the
number of items
Sampling bias: selection process may be biased
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most often
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may, by pure chance not be representative
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chosen might be the 50 tallest in the population
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This can be
of the curve
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One method is:
The standard deviation is a measure of the width of
1
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It gives an indication of the range of values
2
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computer, obtain a series of coordinates
Calculating standard deviation:
3
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∑ = the sum of
X = measured value
-x = mean value
n = total number of values in the sample
Title: AQA AS BIOLOGY QUANTITATIVE INVESTIGATION
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.