A researcher has 2 separate groups of subjects and wants to conduct an Independent Groups t-Test. Before she can do so she needs to conduct a preliminary test to determine if a parametric test is allowed. Which preliminary test must she conduct and
what is the purpose of that test?

What is the quadric regression equation that fits these data

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297

(x-5)1/2+5=2 what is possible solution of this equation