International A Level Biology / Practical Skills in Biology I
Mean, range, standard deviation and error bars
Edexcel International A Level Biology (YBI11), chapter 13: Practical Skills in Biology I, specification point A.1.2, A.1.6, A.1.10. Part of the full course.
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Repeated biological measurements vary, so averages describe the results and measures of spread show how much they vary. Standard deviation and its bars help you compare spread and judge whether a difference between means may be significant.