1. The problem statement, all variables and given/known data A time series is sampled at 250 Hz. What is the sampling interval and Nyquist frequency of the original signal, before digitising was contaminated with noise at about 300 Hz. At what frequency would this noise appear in the spectrum of the digitised sequence ? Repeat the calculation for noise contamination at 475 Hz. 3. The attempt at a solution I can calculate the sampling interval and Nyquist frequency fine but I dont understand the noise part of the question at all. Any help is appreciated, thanks.