Question: A cognitive psychologist designs a research study to investigate different problem-solving strategies. Subjects are randomly assigned to one of five different groups: each group is taught to use a different problem-solving strategy. After the training, the subjects are given a series of problems to solve using the strategies they have learned. The data are in the following table. Determine if there is a difference in the population means and then use Tukey’s HSD and Fisher’s LSD for significant differences between the individual pairs of means. Let a = 0.05.