The data in file raleigh.dat were obtained by Lord Rayleigh. They are
important historically because they led to the discovery of the inert gas
argon. They measure the mass of nitrogen with a given container at stan-
dard temperature and pressure. Masses are in grams. The key issue is to
examine variations in the masses that are related to the method of prepa-
ration. You are expected to assess the evidence that the source of nitrogen
affects the measured mass, and you are expected to estimate the size of
the effect of source. Keep in mind that there may be differences between
air sources and chemical sources and there may be effects associated with
different extraction methods. You may find it helpful to subtract a con-
stant from each measurement to simplify calculations. It is very important
to note that the extraction methods for air are inherently not the same as
the chemical extraction methods.

Source of nitrogen	Method of extraction	Measurement
Air			Hot copper		2.31035
Air			Hot copper		2.31026
Air			Hot copper		2.31024
Air			Hot copper		2.31012
Air			Hot copper		2.31027
Air			Hot iron		2.31017
Air			Hot iron		2.30986
Air			Hot iron		2.31010
Air			Hot iron		2.31001
Air			Ferrous hydrate		2.31024
Air			Ferrous hydrate		2.31010
Air			Ferrous hydrate		2.31028
Chemical method		Iron and NO		2.30143
Chemical method		Iron and NO		2.29890
Chemical method		Iron and NO		2.29816
Chemical method		Iron and NO		2.30182
Chemical method		Iron and N2O		2.29869
Chemical method		Iron and N2O		2.29940
Chemical method		NH4NO2			2.29849
Chemical method		NH4NO2			2.29889



NO is nitric oxide.
N2O is nitrous oxide.
NH4NO2 is ammonium nitrite