Daily Practice

Higher

28th November 2025

5 questions · Higher tier · 360 questions in this band

1
Data Cleaning and Outliers (Higher)
A data set has lower quartile Q1 = 20 and upper quartile Q3 = 32. Using the rule 'outlier if more than 1.5 x IQR beyond Q1 or Q3', find the outlier boundaries.
2
Correlation and Causation (Higher)
A correlation coefficient of 0.99 is found between two variables using only 4 data points. Give one reason to be cautious about this result.
3
Risk (Higher)
Using the same data, find the absolute risk difference between Drug A and the placebo.
4
Standard Deviation
A data set has a standard deviation of 0. What must be true about every value in the data set?
5
Standardised Scores
A data set has mean 20 and standard deviation 4. Find the standardised score for a value of 28.

You are looking at an earlier sheet. Today's sheet is the one that adds a day.

Your run is kept in this browser only, and there is no account.

Any date always gives the same five questions, so a sheet can be set again or shared. All of November 2025, including the monthly compilation PDF.