Daily Practice

Higher

4th November 2025

5 questions · Higher tier · 360 questions in this band

1
Data Cleaning and Outliers (Higher)
Using the boundaries from the previous question (2 and 50), state whether a value of 55 in the data set would be classed as an outlier.
2
Correlation and Causation (Higher)
Explain why a strong correlation coefficient calculated over a very short time period should be treated with caution when claiming causation.
3
Risk (Higher)
A condition affects 4 in 10000 people who take Treatment X and 2 in 10000 people who do not. State the relative risk, then explain why a headline saying 'Treatment X doubles your risk' could be misleading.
4
Standard Deviation
A gardener groups 10 plants by height: 10-20 cm (midpoint 15, 4 plants), 20-30 cm (midpoint 25, 6 plants). Estimate the standard deviation of the plant heights, to 2 decimal places.
5
Standardised Scores
A runner's time has a standardised score of -2 in a race where the mean time is 40 minutes and the standard deviation is 3 minutes. Find the runner's actual time.

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