Georgie believes that a special juice will increase the productivity of his workers. He creates two groups, two workers per group. Both groups are assigned the same task, stapling a set of papers. Group A is given the special juice to drink while they work. Group
B is not given the special juice. After an hour, Georgie counts how many stacks of papers each group has stapled. Group A stapled
1,320 stacks while Group B stapled 2,200 stacks. Georgie concluded that the juice was not effective in improving productivity.
How would you improve Georgie's experimental design to produce a more valid conclusion?