At the end od $19$th century, Lord Rayleigh discovered that atmospheric air, contains a newbheavier gas $($argon$)$ in addition to nitrogen and oxygen. His work was based on measurements of the density $($mass$)$ nitrogen from air and alternatively nitrogen from the decomposition of ammonium nitrite after removing gas contaminants $($oxygen$,$ water vapor, etc.$)$ from the gas stream. Statistical treatment of experimental data $($t$-$test$)$ from two measurements led to the discovery of argon. A careful analysis of Lord Rayleigh$$s data $($Part I, slide $90)$ shows one unexpected and unexplained feature. The mass measurement of nitrogen gas from ammonium nitrite occurred with much lower precision than the mass measurement of nitrogen gas from gas from air. It is intriguing that ~ $10-$fold difference in precision $($sample standard deviation$)$ was observed for virtually the same two methods. The reason for this observation is not understood. You task is to get familiar with Lord Rayleigh$$ Argon Experiment and answer Bonus Question #$1$:

What is the main reason for the low precision $($relatively large s$)$ of the measurement of the mass$/$density of nitrogen gas from the decomposition of ammonium nitrite in Lord Rayleigh$$ argon experiment? What is the source of such a high variability in this experiment?