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Hi Nathan, Thanks for your comment. And no offense taken. :) Most people are surprised how "few" respondents it takes to get to 5% margin of error at 95% conf

by ckelly 13y ago

Hi Nathan, Thanks for your comment. And no offense taken. :) Most people are surprised how "few" respondents it takes to get to 5% margin of error at 95% confidence levels: https://en.wikipedia.org/wiki/Margin_of_error#Different_confidence_levels https://en.wikipedia.org/wiki/Margin_of_error#Different_conf... In this case, .98/sqrt(365) = 5.1% So, perhaps counterintuitively, 300-400 respondents gives good read on large populations (like Snapchat users...or the US population!).

tomato_sausage 13y ago
Assuming the respondents are uniformly randomly chosen, it takes surprisingly few people to get a pretty high confidence interval. I'm not convinced that the respondents are uniform, but I expect that there is a sufficient distribution that the results are still interesting. 3x vs. 1.5x seems like a small difference to me, but I am not an investor or user, so....
- michaelmior 13y ago
  Yes, this exactly. The assumption of uniform distribution is not one to be taken lightly.