Posted: Mar 25, 2015 2:53 pm
by DavidMcC
Dolorian wrote:

I have a slight quibble with the rigour of the description of the adult fish-size experiment, because the sound track only mentions the result of one of the three groups - the fish that got smaller when smaller fish were selected. To rule out the possibility that the fish would get smaller even without selection of smaller adults, the results of the other two groups should have been mentioned. This may sound a bit pedantic, but science has to be pedantic about controls to avoid the problem of confirmation bias.