Imagine you are a neurological researcher looking at a PET scan of a 16-year-old boy. Compared to the brain scan of an 8-year-old girl, you'd most likely see

What causes the flow of the action potential?

a. Electrical conduction on the myelin that surrounds the axon b. The flow of water down the center of the axon c. The movement of ions across the membrane d. The synthesis of neurotransmitters

What happens to the critical value for a chi-square test if the sample size is increased?

a. The critical value increases. b. The critical value decreases. c. The critical value depends on the number of categories, not the sample size. d. The critical value is determined entirely by the alpha level.