Chapter 20 / 9 short lessons
Practical and data skills
Plan a fair investigation, make sense of measurements and choose the right calculation or statistical test.
H2 Biology / 9477 / 2027 syllabus
What do you think?
Two groups have different mean lengths. What do you need before calling the difference convincing?
Lessons
0 of 9 marked as readPlan an investigation that answers the question
Choose variables, controls, repeats and analysis that address a biological hypothesis.
About 6 minMeasure and dilute without losing track
Calculate dilutions and choose measurements with suitable precision and units.
About 6 minMake the pattern easy to see
Present raw data and processed results using appropriate tables, axes, scales and units.
About 5 minRead a rate from a changing quantity
Calculate mean and instantaneous rates and distinguish rate from accumulated product.
About 6 minDescribe both the centre and the spread
Calculate a mean and sample standard deviation, and explain what each describes.
About 6 minTest a predicted ratio with chi-squared
Apply a chi-squared goodness-of-fit test to one row of observed and expected counts.
About 8 minCompare two sample means with a t-test
Use the supplied unpaired t-test equation and table to evaluate a difference between means.
About 8 minTurn a limitation into a useful improvement
Link specific errors and limitations to their effects and to targeted improvements.
About 6 minFood tests, indicators and risk
Carry out and interpret food tests and indicators, make the Benedict's test semi-quantitative, and assess risk with a rating.
About 8 minWhat you will be able to do
- Plan, measure, present and evaluate biological investigations.
- Calculate dilutions, rates, means and standard deviations.
- Apply chi-squared and the supplied unpaired t-test without overclaiming.
Spaced review
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