Growth of 20 yam stalks in 7 days
Use this simulation to demonstrate that repetition of the data collection would usually result in different values. The point again is that a single sample is not as important as the 'process' behind the data — i.e. we want to generalise from the sample to something more fundamental about the growth of yam stalks in general.
This is a simulation but the context is that yam plants were grown in a research station and the growth (cm) of the main stalks over 7 days was recorded from each plant.