2 ms·

>The amount of data needed to tell between two normal is about 30 data points What are you trying to say here? If there are two normal distributions, both wit

>The amount of data needed to tell between two normal is about 30 data points What are you trying to say here? If there are two normal distributions, both with variance one, one having mean 0 and the other having mean 100, and I get a single sample from one of the distributions, I can guess which distribution it came from with very high confidence. Where did the number 30 come from?

sndean 3y ago
> Where did the number 30 come from? Yeah, I've also heard 30 for normal distributions over and over in ~7 stats courses that I've taken. This SE stats answer sounds reasonable enough: https://stats.stackexchange.com/a/2542 https://stats.stackexchange.com/a/2542