> 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
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
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?