A group of researchers is studying the effect of saltwater concentration on metabolism in guppies. They separate their guppies into 6 groups, each containing 3 guppiesAll groups will undergo one control trial and one experimental trial. The researchers then analyzed the results. What type of analysis did they perform and what is the n of this experiment ? paired analysis, n = 18 unpaired analysis , n = 3 paired analysis, n = 6 unpaired analysis, n = 18 unpaired analysis, n = 6 paired analysis, n = 3