Quote:
Originally posted by RatedG²
fff you obviously can't get data from all 10K populations. And even if you could, it's not practical. It's just a sample size which is reflective of a larger population. No one is concerned about your math 
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Ugh, okay. Follow me here.
52% of the animals from 3000 species and 10000 populations are gone.
For this example, we'll say that the grand total amount of animals studied was 30,000,000 (10,000 animals per species)
Multiply that by 52% (.52)
This would mean that 15,600,000 animals are gone.
Take that same ratio, and apply it to my previous number of 89,000. 10,000 animals per species would make that number 890,000,000 for a grand total.
Take away the 15,600,000 and you are left with 874,400,000.
Take the 874,000,000 and divide it by the total amount of populations (890,000,000)
You get 98.4%
This means that even though 52% of the surveyed species are gone this makes up only 1.8% of
all of the species in the world. It is extremely easy to manipulate statistics and the title of this thread does not by any means reflect what is actually being said in the article.
This is of course all hypothetical on my end, as I don't know all of the populations of each animal as you pointed out. That doesn't take away from the fact that saying half of all animals are gone when the data is only representative of an obscenely (comparatively) small body.
Edited for formatting
Second edit to provide added clarity
Third edit because of a spelling error that was bothering me
Fourth edit, because I am committed now; I downloaded the actual report and it doesn't disclose any population sizes, not the animals used. Still sketchy.