Problem 3

Wael and Letty have both measured the mass density of an object a few times. Their results are shown below in g/cm³

Wael	Letty
2.55	2.65
2.59	2.71
2.61	2.59
2.54	2.71
2.61	2.61
2.60	2.59

Wael calculates the mean value to be 2.58 g/cm³, and Letty 2.64 g/cm³.

Wael says: 'We cannot have measured objects with the same density, because our mean values are different.'

Letty says: 'We might have measured objects with the same mass density, because we have overlap in our uncertainty intervals.'