Daily Practice

Higher

29th September 2025

5 questions · Higher tier · 360 questions in this band

1
Data Cleaning and Outliers (Higher)
Test scores out of 50 are: 32, 28, 35, 30, 29, 31, 95. Which score cannot be correct, and why?
2
Correlation and Causation (Higher)
State the term used for a variable that affects both variables in a study, potentially producing a correlation without direct causation.
3
Risk (Higher)
The risk of an event is 15% in Group 1 and 5% in Group 2. Find both the relative risk and the absolute risk difference for Group 1 compared with Group 2.
4
Standard Deviation
A shop records the number of items bought by 10 customers: 1 item (2 customers), 2 items (3 customers), 3 items (5 customers). Find the standard deviation, to 2 decimal places.
5
Standardised Scores
A data set has mean 50 and standard deviation 10. Find the standardised score for a value of 35.

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