Record data in clear tables
Separate raw and processed results, place units in headings and keep measurement precision consistent.
Cambridge International Biology 9700, 2028–2030. Paper 3 assesses practical skills in a supervised laboratory; these lessons support preparation but do not replace safe, supervised laboratory experience.
Before you begin
- Use biological vocabulary and basic calculations from the AS Biology course. Follow your school laboratory rules and teacher instructions for all practical work.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Where should the unit normally appear in a results table?
What you will learn
- Construct tables with descriptive headings and units.
- Place variables in a clear order and separate raw from processed data.
- Choose decimal places appropriate to the measuring instrument.
Make each column unambiguous
Use descriptive headings that identify the quantity and unit, for example “time / s”. Put units in headings rather than repeating them in every cell. Put the independent variable before the dependent variable in a vertical table.
Record raw measurements exactly as observed. Put calculated or averaged values in a separate labelled column so readers can distinguish what was measured from what was derived.
Use consistent precision
The instrument sets a sensible recording precision. If a ruler reads to 1 mm, measurements should not imply hundredths of a millimetre. Record a consistent number of decimal places when the apparatus supports that precision.
A qualitative table should use specific, consistent descriptions and clearly identify which sample or condition each observation belongs to.
Pause and explain
A measuring cylinder is read to the nearest 1 cm³. Which recording is most appropriate?
Worked example
Rewrite the heading “distance” for a table measured with a ruler to the nearest millimetre.
Show the worked solution
- Name the quantity and unit in the heading.
- Use the same unit throughout the column.
Answer Use a heading such as distance / mm. Keep units out of the individual data cells.
From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Create suitable headings for a table containing substrate concentration, three reaction times and mean rate.
Give me a hint
Include units and distinguish raw repeats from the processed mean.
Compare my reasoning
- Place substrate concentration first.
- Label each time repeat in seconds.
- Label the calculated mean rate with its unit.
For example: substrate concentration / mol dm⁻³; time to endpoint / s (repeat 1, repeat 2, repeat 3); mean rate / s⁻¹. The chosen rate definition should be stated.
Look for these in your work
- Quantities named
- Units included
- Raw and processed values separated
A student records 4.2, 4.25 and 4.3 cm³ for the same apparatus reading to 0.1 cm³. What should be checked?
Give me a hint
Compare precision with the instrument scale.
Compare my reasoning
- The recorded decimal places are inconsistent.
- Use the same justified precision, likely one decimal place for this instrument.
- Do not add digits unsupported by the scale.
Check that readings are recorded consistently to the instrument’s 0.1 cm³ resolution; 4.25 cm³ implies unsupported precision.
Look for these in your work
- Instrument precision considered
- Consistent decimals proposed
A table has only one column called “result”. Why is this insufficient for another learner?
Give me a hint
Clarify which variable, condition and unit each value represents.
Compare my reasoning
- Rename the column with the measured quantity and unit.
- Add the independent-variable condition or sample identity.
- Separate repeats and processed results if relevant.
Use descriptive headings that identify the variable, conditions or sample, and unit; separate repeats and calculated results.
Look for these in your work
- Unambiguous headings
- Condition and unit recorded
Common mistakes
- Placing units in every cell instead of the heading.
- Mixing inconsistent decimal places without an instrument reason.
- Calling an average a raw result.
What can you explain now?
Where should the unit normally appear in a results table?
Compare with the explanation
In the column heading
This makes the measurement unit clear for the whole column.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
How do a raw measurement and a processed result differ in a table?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.