That's a fair concern. The sample sizes here are relatively high: you can probably back some estimates out yourself from the numbers given in the post (millions of dollars raised, mean donation of $88, 14% of donations in the last week were repeat, etc). I'll also say that the comparisons in the post are significant to a 99% confidence level.
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That's a fair concern. The sample sizes here are relatively high: you can probably back some estimates out yourself from the numbers given in the post (millions of dollars raised, mean donation of $88, 14% of donations in the last week were repeat, etc). I'll also say that the comparisons in the post are significant to a 99% confidence level.