Google Quantitative Analyst interview questions

First let me intorduce myself and then my dissertation. Afterwards, he asked a question about questionnaire design, measurement error and estimate of the proportion of truly interested customers and falsely reporting rate.

The technical interview was unexpected. The interviewer did not ask a single question about statistics or programming. Rather I was asked a domain-specific question about Google ads, which continued for the rest of the interview. I was not expecting another data scientist interviewing me about a hypothetical feature. I am also not sure why the interviewer decided not to pursue further, even though I did well in brainstorming ideas on how to test a hypothetical feature in Google ads.