Randomized Comparative Experiments
`Subjects are randomly assigned to one of at least two
treatment groups.
`The same response variable is measured for all the
treatment groups and then compared together.
x
x
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Guidelines and tips
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Randomized Comparative Experiments, Exams of Probability and Statistics
In a clinical trial a researcher may unconsciously place healthier looking patients into the group getting the new drug on interest.
Typology: Exams
2022/2023
1 / 8
This page cannot be seen from the preview
Don't miss anything!
Related documents
Partial preview of the text
Download Randomized Comparative Experiments and more Exams Probability and Statistics in PDF only on Docsity!
Randomized Comparative Experiments ^ Subjects are randomly assigned to one of at least twotreatment groups.^ The same response variable is measured for all thetreatment groups and then compared together.
x^ x
Randomized Comparative Experiments `^ Randomization is important so that bias is not added intothe selection of treatment groups.Ex. In a clinical trial a researcher may unconsciously placehealthier looking patients into the group getting the newdrug on interest.
Diagram of Example 1^ 20 RoseBushes
New Soil(10) Current Soil(10)
Compare : โข^ Size โข^ Color โข^ HealthBetween 2 groups Randomization
Diagram of Example 3^ 80 OverweightAdult Males
Low Carb/Aerobic(20)Low Fat/Pilates(20)
Compare Weight Lossof men between 4Groups Low Carb/Pilates(20)Low Fat/Aerobic(20)Randomization
Example 5^ ^ Explanatory Variables โ Salinity and Nutrients^^ Treatments โ^ ^ Subjects โ The shrimp in the 12 tanks^^ Response โ Growth of the shrimp
6;^ A-High,
A-Low,B-High, B-Low,C-High, C-Low
12 Tanksof Shrimp
A โ High(2)A โ Low(2)B โ High(2)B โ Low(2)RandomizationC โ High(2)C โ Low(2)
Compare growthof the shrimpbetween the 6groups
^ Explanatory Variables โ^ Treatments โ ^ Subjects โ^ Response โ
Example 6^ Explanatory โ^^ Explanatory โ Dietary Suppliment^ ^ Treatments โ^^ Treatments โ Glucosamine and Chondroitin^ ^ Subjects โ^^ Subjects โ 300 Dogs^ ^ Response โ^^ Response โ Changes in joint and hip health^ ^ Control Group?^^ Control Group? A control group would give a goodcomparison of joint and hip health in health dogscompared to dogs on the two drugs.300 Dogs
Glucosamine(100)Chondrotin(100)Nothing(100)
Compare Hip and JointHealth Between the 3Groups Randomization