Drawing conclusions from evidence (age 12+)
Identify patterns and trends in data, draw conclusions that directly address the hypothesis with quantitative reference to evidence, and evaluate the investigation by distinguishing between systematic and random errors and proposing targeted improvements
What a learner can do afterwards
- Identifies the pattern or trend in a graph or data table using specific values
- Writes a conclusion that references the hypothesis, states whether the prediction was supported, and quotes numerical evidence
- Distinguishes between a systematic error (affects all readings in the same direction) and a random error, and proposes a specific procedural improvement to address each
The lesson
When you write a conclusion, do more than say what happened. Describe the trend using numbers, say whether the evidence supported your hypothesis, and judge how reliable your method was.
Two kinds of error can affect your investigation. A systematic error pushes every reading the same way, like a thermometer that always reads 3°C too low. A random error changes unpredictably from trial to trial, like a small difference in when you start a stopwatch by hand.
Priya hypothesized that hotter water makes a fizzy tablet dissolve faster. Her data show dissolve time falling from 42 s at 20°C to 15 s at 50°C. Her conclusion: 'My hypothesis was supported. As temperature increased from 20°C to 50°C, dissolve time decreased from 42 s to 15 s.' She also noticed her thermometer always read 3°C low, a systematic error, so she suggests recalibrating it before the next trial. Her repeated trials at the same temperature varied slightly too, a random error from hand-timing, so she suggests using an electronic timer triggered by sound instead.
When you suggest an improvement, do not just write 'do more repeats.' Name the exact problem, like a mis-calibrated thermometer or hand-timing, and say exactly what you would change instead.
A strong conclusion states the trend with numbers, says whether the hypothesis was supported, and names the type of error with a specific fix.
Watch it
Where it sits
Where this leads
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.