| Time / s | Temperature / °C | pH | Reading 1 / mm | Reading 2 / mm | | :--- | :--- | :--- | :--- | :--- | | 0 | 20.0 | 7.0 | 12.0 | 11.5 | | 30 | 21.5 | 7.0 | 14.0 | 13.5 |
Before diving into notes, understand the structure:
A common killer for high-scoring students. Annotated drawings earn marks; artistic drawings do not. biology 9700 practical notes
You don't need to calculate them by hand (you get a formula sheet), but you MUST know why you choose one.
| Test | When to use | | :--- | :--- | | Chi-squared (( \chi^2 )) | Counted categories (e.g., red vs. white flowers). Looking for association. | | Student's t-test | Comparing means of two groups (e.g., treated vs. untreated plant height). | | Spearman’s rank | Looking for correlation between two variables (e.g., temperature vs. enzyme rate). | | Time / s | Temperature / °C
Explain why you control pH: "To ensure that only temperature affects enzyme activity, preventing pH from acting as a confounding variable."
You don't need a lab for this paper; you need common sense and specific vocabulary. Before diving into notes, understand the structure: A
Paper 5 tests your ability to think like a scientist without setting foot in a lab. It is divided into planning an experiment and analyzing data.