Daily Practice

Foundation

26th February 2026

5 questions · Foundation tier · 282 questions in this band

1
Time Series
On a time series graph, what is always plotted on the horizontal axis?
2
Population Pyramids
A pyramid has a wide base and a narrow top. What does this suggest about the population?
3
Choropleth Maps
A choropleth map of rainfall uses two different hues (for example yellow to red) rather than one hue getting darker. Why can this style of shading be a problem?
4
Data Cleaning and Outliers (Foundation)
Give one reason you might choose to keep an outlier in a data set rather than remove it.
5
Correlation and Causation (Foundation)
A scatter graph shows that as temperature increases, the number of hot drinks sold decreases. What type of correlation is this?

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