You are looking to determine if there is a difference in the…

You are looking to determine if there is a difference in the reported frequency of PA students and non PA students donating blood. You ask 50 PA students and 50 non PA students if they have donated blood in the past year. Which test should you run to answer your question?

Deep scattering layer Oceanographers and fishing crew are fa…

Deep scattering layer Oceanographers and fishing crew are familiar with the “deep scattering layer” on fish-finder sonar systems. a)  What is this layer?  Be as specific as you can. b)  When does this layer move up, and why? c)  When does this layer move down, and why?