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AQA AS/A Level Biology - Introduction to Statistics (2020-21) £9.99
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AQA AS/A Level Biology - Introduction to Statistics (2020-21)
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An in-depth informative booklet on Statistics used in Biology including Spearman's rank correlation, Chi squared and the student-t test. Also, includes useful summary questions and exam style questions.

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  • September 21, 2022
  • 9
  • 2020/2021
  • Lecture notes
  • None
  • All classes

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Year 1




Introduction to
Statistics




Name:


Teacher:
1

, Biology’s Problem
Results from biology experiments, unlike physics and chemistry, often don’t give clear cut patterns.
There are several reasons for this:

1.
2.
3.

We can call all these problems ‘chance’ factors.
Our problem is to decide whether any pattern we think we have could just be due to chance factors or whether
it is clear enough for us to see that something significant is going on.

Statistical tests let us do this.

Example
In this case the stats test generates a number ‘r’ which measures how good the correlation is. We are more confident
that this is a significant result if r is high.

If r = 1 then we have a perfect positive correlation, if r = -1 we have a perfect negative correlation, if r = 0 then no
correlation at all.




2

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