Many humans like the effect of caffeine, but it occurs in plants as a deterrent to herbivory by animals. caffeine is also found in flower nectar, and nectar is meant as a reward, not a deterrent. how does caffeine in nectar affect visitation by pollinators? singaravelan (2005) set up feeding stations where bees were offered a choice between a control solution with 20% sucrose or a caffeinated solution with 20% sucrose plus caffeine. over the course of the experiment, four different concentrations of caffeine were provided: 50, 100, 150, 200 ppm. the response variable was the difference between the amount of nectar consumed from caffeine feeders and that consumed from control feeders at the same station (in grams; relatively more feeding on caffeine yields a positive number, while relatively more feeding on control yields a negative number). here are the data: 50 ppm100 ppm150 ppm200 ppm-0.40.010.650.240.34-0.390.530.4 40.19-0.080.390.130.05-0.09-0.151.0 3-0.14-0.310.460.05a. what is the null hypothesis for the comparison of the difference in consumption between the four treatment groups? what is the alternative hypothesis? b. which of the sum squares do you expect to be greater this time ssgroups or sserror?