system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can asking a sample size of 1,003 people give an accurate view of over 250 million people?
gpt
It assumes that you have a properly random sample of the population. Suppose you have a (very large) bag full of millions of balls. You draw out 1003 without looking, and get 600 reds. How confident would you be that close to 60% of all the balls in the bag are red?