Daily Practice

Higher

22nd December 2025

5 questions · Higher tier · 360 questions in this band

1
Data Cleaning and Outliers (Higher)
A set of weekly pocket money amounts, in pounds, is: 5, 6, 5, 500, 7, 6. Identify the likely outlier.
2
Correlation and Causation (Higher)
Two variables have a correlation coefficient of 0.08. What does this suggest about a causal link between them?
3
Risk (Higher)
Using your answers to the previous two questions, find the relative risk of nausea for Drug A compared with the placebo.
4
Standard Deviation
Class A's test scores have mean 65 and standard deviation 4. Class B's test scores have mean 65 and standard deviation 9. Which class's scores were more consistent, and why?
5
Standardised Scores
In a history test, mean = 70, standard deviation = 5; in a geography test, mean = 65, standard deviation = 8. Aisha scored 78 in history and 77 in geography. Use standardised scores to decide which subject she did relatively better in.

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