MathWorks Interview Question

1) Math concepts : What is an integral? What is a derivative? Signal Processing: What is continuous time system? What is a discrete time system? How do you convert one to the other? What is an LTI system? What is causality? Relationship between Z transform and Fourier transform Z transform of a given impulse response? Is it casual? Given a Z transform, is it stable? Given an impluse response, is the system stable? What are random processes? What is a PSD? What does PSD of white noise look like?