Problem 1

Gordon and Giada have each measured the mass of a coin six times. The measurements are indicated with the red crosses, and the mean values with a blue dot, they have not yet drawn the uncertainty interval. They are discussing whether they have measured a coin with the same mass.

Gordon says: 'We must have measured a different kind of coin because our mean values are very different.'

Giada responds: 'We must have measured a different kind of coin because our uncertainty intervals do not overlap.'