CWT Programme Analyst interview questions

First, you have to introduce yourself and then answer some behavior questions including your strength and weakness, your education experiences and your professional skills. when they ask me why to change my major from engineering to computer science, I kind of make a mistake, I said people work in computer industry seems smart and the interviewer seems very unpleasant, which can be the reason why I did not get the job. The interviewers were very friendly by the way.