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IB Biology HL 3.2.15 Box-and-Whisker Plots

Practise analysing HL box plots to compare medians, ranges and outliers, calculate differences and justify conclusions from biological datasets.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Compare medians, ranges and interquartile spreads across biological groups using box plots.
  • Estimate values and calculate median differences from labelled box-and-whisker plots.
  • Justify conclusions about group differences using spread, outliers and plotted evidence.

D3.2.15—Box-and-whisker plots question 1

[Maximum number: 3]

Male and female human skeletons obtained from different archaeological sites in Greece were studied in order to find trends in human height evolution in Europe. The box-and

whisker plots show heights of skeletons dating from two historical periods: Neolithic (6500-3000 BC) and Roman (146-324 AD).

Figure for Question D3.2.15—Box-and-whisker plots question 1 — IB Biology HL

Question (a)

(a)

Using the graph,

[ 3 ]

Question (i)

(i)

Using the box-and-whisker plot, estimate the median height of females in the Roman period.

[ 1 ]

Question (ii)

(ii)

Using the box-and-whisker plot, estimate the maximum height of males in the Neolithic period.

[ 1 ]

Question (iii)

(iii)

State the reason that some of the data points were plotted outside the whiskers.

[ 1 ]
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