Sample A: The sales figures for books in Germany and France between 2010 and 2015.

Sample B: The quantity of literature purchased by people in Germany and France over a five-year period starting in 2010.

Sample A: The number of people travelling by air in Australia and New Zealand from 2005 to 2010.

Sample B: Air travel volume for Australia and New Zealand over the period of 2005 to 2010.

Sample A: Changes in the number of inhabitants in Brazil and Mexico between 2000 and 2010.

Sample B: Demographic increases recorded in Brazil and Mexico during the first decade of the 21st century.

Sample A: The amount of oil produced by Saudi Arabia and Iran from 2005 to 2010.

Sample B: Oil output figures for two Middle Eastern nations, Saudi Arabia and Iran, over a five-year timeframe (2005–2010).

Sample A: The speed of internet connections in South Korea and Singapore between 2010 and 2015.

Sample B: Average broadband speeds measured in South Korea and Singapore from 2010 to 2015.

Sample A: The average lifespan of people living in Japan and the US from 2000 to 2010.

Sample B: How long people were expected to live on average in Japan and the United States between 2000 and 2010.

Sample A: The count of students graduating from universities in the UK and Canada between 2010 and 2015.

Sample B: Higher education graduation rates in the United Kingdom and Canada over a 5-year period.

Sample A: The amount of power used in China and India from 2005 to 2010.

Sample B: Electricity usage figures for China and India between the years 2005 and 2010.

Sample A: The percentage of people possessing smartphones in the US and Canada between 2010 and 2015.

Sample B: Rates of mobile phone ownership in the United States and Canada from 2010 to 2015.

Sample A: The amount of green energy generated in Germany and Spain from 2000 to 2010.

Sample B: Renewable power output in Germany and Spain over the decade between 2000 and 2010.