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STA CHAPTER 6

QuestionAnswer
Double-blinded experiment Neither subjects nor the people who work with them know which treatments each subject is receiving
3 Occurrences in an experiment that cause bias 1. Refusals 2. Nonadherers 3. Dropouts
Refusals If a participant refuses a medical experiment, it is serious! Bias can result if those who refuse are systemically different from those who cooperate
Nonadherers Subjects who participate but don't follow the experiment treatment. Changes the result!!
Dropouts Subjects who begin the experiment but do not complete it Drop out due to treatment= bias!!
Can you generalize the conclusion of an experiment you just conducted? NO You can not generalize a conclusion you find of a small sample to a population Some experiments apply unrealistic treatments, some use subjects from some special group. All are performed at some specific time and place!!
Matching the subjects in various ways can produce more precise results than simple randomization
Matched pair designs Compare 2 treatments by giving one to each of a pair of similar subjects, or by giving both to the same subject in random order
Block designs Form blocks of similar subjects and assign treatments at random separately in each block
Difference between blocks and stratas? Blocks= Experiments Stratas= Samples Onika= Burgers
Created by: liladdoyle
 

 



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