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Data handling and analysis

Data handling and analysis

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Question 69

An agricultural scientist is investigating the effect of deficit irrigation on the root development of a new drought-resistant crop variety.

Twelve seedlings in Group X ('Deficit Irrigation') were grown with restricted watering, while twelve different seedlings in Group Y ('Normal Irrigation') were grown under standard watering conditions. After 28 days, the primary root length of each seedling was measured to the nearest millimetre.

The results are shown in Table 1 below.

Table 1: Primary root length (mm) of seedlings

Group X (Deficit Irrigation)Group Y (Normal Irrigation)
182284
165271
191315
210290
174322
185265
201301
169288
195310
204279
180295
178306

State, with justification, the most appropriate measure of central tendency for calculating the average root length for each of the two groups of seedlings in Table 1.

[2]
Markscheme

Data handling and analysis Questions

  1. A Level
  2. /Psychology
  3. /Data handling and analysis

235 exam-style questions on AQA A Level Psychology Data handling and analysis. Each one has a worked solution and a mark scheme showing where the marks go.

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