I applied through university. I interviewed at Fraunhofer (Bayreuth) in Jan 2022
Interview
Two interviews. First interview with other working students and PhD candidates. Second interview with Professor. You will be asked a number of substantive questions relating to the area you are applying for. In my case, the questions were about computer science and statistics.
Interview questions [1]
Question 1
Why do you square the differences when calculating standard deviation?