International A Level Biology / Practical Skills in Biology I
Mean, range, standard deviation and error bars revision notes
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.
Watch the video lesson · International A Level Biology past papers
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.