Controlled Experiment by CrashCourse Statistics
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Controlled Experiments
key words
controlled experiments, simulation, randomized block design, placebo effect, single blind study, double blind study, matched pair experiment
Video links
Key questions
Why controlled experiment?
what is simulation?
Interesting Points
Simulation prove the effectness of drug
a simulation with real drug = effect A
a simulation with placebo = effect B
Experiments
split groups for different treatments
record results to study
Bias vs Randomness
allocation and selection bias
use randomness to eliminate bias
Treatment
e.g., new drug
levels of drug dosages
controls = no treatment
Placebo Effect
placebo: no treatment but make people believe to take real treatment
placebo effect: results due to believing in receiving real treatment
Awareness will affect placebo effect
single blind study
- subject is blind
double blind study
- prevent researchers is blind
- gold standard
Matched Pair experiment
make the groups identical
the significance of the difference between two group results will be more apparent