Edexcel IAL Biology 3P.8 Processing and analysing practical data

Write the formula, substitute unrounded values, complete intermediate table columns and round only the final answer to the requested precision with units.

Exam points

Calculate rates, means, percentage changes or ratios from biological measurements.
Complete ranks, differences or squared terms before calculating a statistical value.
Report processed values to required significant figures, standard form and units.

[Maximum number: 1]

The effect of atropine and propranolol on heart rate was investigated.

One group of people, group 1, were given propranolol each day for four days followed by atropine for four days.

A second group of people, group 2, were given atropine each day for four days followed by propranolol for four days.

The graph shows the results of this investigation.

Mean heart rate/ beats $\mathrm{min}^{-1}$

Figure for Question 3P.8—Processing and analysing practical data question 1 — Edexcel A-Level Biology AS

Calculate the change in mean heart rate for group 2 after 8 days.

Answer beats $\mathrm{min}^{-1}$

32 (beats $\mathrm{min}^{-1}$ )

(1)

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3P.8—Processing and analysing practical data question 1