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\phantom{1}\\  \textbf{Key Discussion Points}  It is worth emphasising that students should 'add `add  errors in quadrature' when the errors are generated by random fluctuations. If the fundamental uncertainty of the measuring equipment is the limiting factor, the quadrature approach is no longer appropriate. This is covered in appendix A4.1 under the discussion of dependent and independent quantities. Section 1.3 - Archimedean method of determining volume by placing the coin in water and measuring the volume of displaced water would be good example.\\  Section 5.1 - Students should use $\frac{\mu_1 - \mu_2}{\sigma}$ formula\\