How many people would need to answer a survey of 1000 questions before the aggregate data from the survey is sufficiently anonymous?

Websites release statistics on their user base all the time and it’s not considered a breach of privacy because their user bases are so large that it’s impossible to pick apart who thinks or watches what. Additionally when nations or state… Continue reading How many people would need to answer a survey of 1000 questions before the aggregate data from the survey is sufficiently anonymous?