power

  1. S

    Difference needed for power in fixed population.

    Hi, I am designing a study to examine the difference made by implementing a new treatment strategy for a medical condition. I have become a little stuck on some of the statistics. I want to determine if the new strategy is effective. I can assume that the population number is fixed...
  2. C

    Required population size

    Have a few problems that I need some help with. It's been a while since I've done stats. Please don't just give the answers but explain how you got them, what formulas used. Thanks!! 1. You want to compare biceps skinfold in patients with Crohn’s disease to the biceps skinfold in healthy...