If we set the mass of the Earth as 1.0 we can then list the masses of all of the traditional planets in our solar system in terms of number of Earth masses (rather than a bazillion kg or whatever).The following table lists the masses of the 9 planets in our system in Earth masses.Oh and don't give me the whole 'Pluto isn't a planet any more', I know that, the numbers don't know though and this is a great question.....

PlanetMass (in 'earths)

Mercury.055

Venus.815

Earth1.0

Mars.107

Jupiter318

Saturn95.2

Uranus14.6

Neptune17.2

Pluto.002

d)The inner planets (Mercury, Venus, Earth and Mars) seem to be quite a bit smaller than the four gas giants (Jupiter, Saturn, Neptune and Uranus).Are they significantly different? Explain your answer by doing a t test.(15)