Daily Practice

Foundation

27th July 2026

5 questions · Foundation tier · 282 questions in this band

1
Data Cleaning and Outliers (Foundation)
Explain why the median might be a more appropriate average to use on a data set with an outlier, instead of removing the outlier first.
2
Correlation and Causation (Foundation)
A study finds a positive correlation between shoe size and reading ability in primary school children. Does having big feet cause better reading?
3
Risk (Foundation)
In a trial, 3 out of 150 patients taking a new drug had side effects. Write this risk in '1 in n' form.
4
Skewness by Inspection
A box plot shows a long whisker on the left and a short whisker on the right, with the median close to the right of the box. What type of skew does this suggest?
5
Percentiles
A data set of 50 exam scores has the 20th percentile at 42 marks and the 80th percentile at 78 marks. Explain what these two values tell you about the middle 60% of scores.

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