Problem 6

  1. Observational Study, since we didn’t randomly assign subjects to treatments

  2. variables are how much people pay and how often, and what the background is

  3. increased statistically means that the chances that this result was random is less than 5%, or around 2 standard deviations

Problem 7

  1. Experiment since they were subject to treatments

  2. 30 bipolar people

  3. 1 factor - fish oil omega 3 fats 2 levels - dose vs no dose

  4. 2

  5. Wether the patients condition improve

  6. unknown

  7. single blind, since there are both real doses and placebos

  8. Wether omega 3 from fish oils can improve bipolar disorder

Problem 15

  1. Observational Study, since there was no treatments

  2. prospective study, since they found people then observed them after they saw a sad movie

  3. 2 types of Subjects: people with and without depression

  4. Parameters were ehow much each group of people cried when exposed to sad events

  5. no noticable difference for people with or without depression and how much they will cry