Which of the following experimental designs may be suitable for analysis as a Model I ANOVA? (a) A fisheries biologist was interested in testing the general hypothesis that the mean size of adult trout varied among lakes in Canterbury, New Zealand. They selected three lakes (Lake Veronica, Lake Michael and Lake Monica) at random from a total of 21 lakes, and took a sample of ten adult trout from each of the three lakes. (b) A fisheries biologist was interested in testing the specific hypothesis that the mean size of adult trout varied among Lake Veronica, Lake Michael and Lake Monica, so they took a sample of ten adult trout from within each of the three lakes.