A student investigating transpiration rates measured the following water uptake values in cm³ per hour: Trial 1 = 4.2, Trial 2 = 4.8, Trial 3 = 4.5, Trial 4 = 12.1, Trial 5 = 4.4. Which value should be treated as an anomalous result?

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Question

A student investigating transpiration rates measured the following water uptake values in cm³ per hour: Trial 1 = 4.2, Trial 2 = 4.8, Trial 3 = 4.5, Trial 4 = 12.1, Trial 5 = 4.4. Which value should be treated as an anomalous result?

Accepted Answer

12.1 cm³ per hour — 1 cm³ per hour. Award 1 mark for correct identification. This value is significantly different from the other four results, which cluster around 4.2–4.8 cm³ per hour. Anomalous results do not fit the pattern of other measurements and should be excluded from calculations of means. C, D and B are incorrect because these values are all within a similar range and consistent with each other.

Answer

4.2 cm³ per hour

Answer

4.4 cm³ per hour

Answer

12.1 cm³ per hour

Answer

4.8 cm³ per hour

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