To interpret an observation table, find the trend, compare the columns and then suggest a likely cause. A list of numbers shows you can read the table; a link between the numbers shows you understand the system.
This lesson is in the SPM subjects section. The table below is an original, fictional one written for practice.
What does interpreting a table involve?
It has three steps. First describe the direction of change in each column, then compare columns that might be connected, then state a cautious explanation.
Skipping the middle step is the usual gap. Students describe each column separately and never say how they relate.
Worked example: two fictional tanks
Two tanks each hold 30 fish of the same kind. Tank A sits in shade. Tank B sits in full sun. Readings were taken each morning for five days, and the last column counts fish seen swimming at the surface.
| Day | Tank A water (°C) | Tank A fish at surface | Tank B water (°C) | Tank B fish at surface |
|---|---|---|---|---|
| 1 | 27 | 2 | 28 | 2 |
| 2 | 27 | 2 | 30 | 4 |
| 3 | 28 | 3 | 32 | 7 |
| 4 | 27 | 2 | 33 | 9 |
| 5 | 27 | 2 | 31 | 5 |
Step 1, trend. Tank A stays between 27 and 28 °C and the surface count stays at 2 or 3. Tank B rises from 28 to 33 °C over four days, and its surface count rises from 2 to 9.
Step 2, comparison. Tank B’s temperature and its surface count move up together. Tank A shows neither change, so it works as a comparison.
Step 3, likely cause. Warmer water holds less dissolved oxygen, so fish may come to the surface where the water has more oxygen. On day 5 the temperature fell to 31 °C and the count fell to 5, which supports the link.
The mistake that loses marks
A weak answer reads: “Tank B was 28, 30, 32, 33, 31 and the fish were 2, 4, 7, 9, 5.” Every number is correct, yet the answer never says what the numbers mean.
A stronger answer keeps one or two figures and adds the link: “As Tank B warmed from 28 to 33 °C, fish at the surface rose from 2 to 9, which suggests the warm water held less oxygen.”
Careful words and what to check next
A table cannot prove a cause, because something else might have changed too. Use phrases such as “suggests”, “is linked to” and “may be because”.
Then add one sensible follow-up, such as measuring dissolved oxygen directly or repeating the readings with a shaded Tank B. Your school teacher decides which follow-up is practical in the lab.
Check yourself
A fictional Tank C shows this: Day 1 water clear and all feed eaten; Day 3 water slightly cloudy and some feed left; Day 5 water very cloudy and most feed left. Write two sentences that interpret the pattern.
Answer
As the water became cloudier from day 1 to day 5, the amount of uneaten feed rose from none to most of it. This suggests the fish were eating less, possibly because the water quality was getting worse.
A cautious extra line would be that the uneaten feed may itself be making the water cloudy, so the two changes could feed each other.
What to study next
Practise the same habit on your own written answers with the structured-answer self-review tool, so you can check that each answer names a trend, a link and a cause.
If you want a teacher to read more tables with you, see online one-to-one Aquaculture and Recreational Animals tuition and the one-hour trial class (from RM50). Practical work with live animals stays at school.