Daily Practice

Foundation

8th October 2025

5 questions · Foundation tier · 282 questions in this band

1
Time Series
Explain why using a time series trend to estimate a value many years into the future is less reliable than estimating one year ahead.
2
Population Pyramids
Country A's pyramid has a wide base and narrow top; Country B's has a narrow base and a wide middle/top. Which country most likely has the higher birth rate?
3
Choropleth Maps
Give one limitation of choropleth maps.
4
Data Cleaning and Outliers (Foundation)
A data set of ages is: 12, 13, 12, 14, 13, 99. Which value is most likely an outlier?
5
Correlation and Causation (Foundation)
Two variables have a correlation coefficient close to 0. What does this suggest?

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 October 2025, including the monthly compilation PDF.