What is the bias
What bias may occur with this question asking about national health insurance?
"Do you agree that a national system of health insurance should be favored because it would provide health insurance for everyone and would reduce administrative costs?"
Wording of the Question
The treatment that has no effect given for the control group
Placebo
The difference between experiment and observational study
Imposing a Treatment Happens Only with Experiments
What is the control group?
We are trying to find out if a new pill works best for treating a condition. We divide our samples into two and place one group on the new pill. The other group is then assigned to the old pill.
The Old Pill Group
The type of bias that may occur when a cop asks a group of teenagers about past drug use?
Response Bias
This is used to compare against the factor, or explanatory variable, the placebo or "old" group.
Control Group
What is one thing that reduces variability
Blocking or Increased Sample Size
What is the sampling design?
We are trying to find out if children below the age of 10 like ice cream A or ice cream B better. To do this, we split the children into groups by gender. We then pull an SRS from both groups to create our sample.
Stratified Random Sample
Voluntary Response
The individual to which treatments are applied
Experimental Units
Confounding variables cannot occur with this type of principle
Randomization
What is the experimental design?
We are trying to find out if a new pill works best for treating a condition. We divide our samples into two and place one group on the new pill and the other group is assigned to the old pill.
Matched Pairs
The bias that occurs when a random sample of only honors students are chosen for a survey used with a population of all students within the school
Under Coverage
This is when the experimental units do not know which treatment they are getting
Blinding
The three principles needed for an accurate experiment
Control, Replication, and Randomization
What is the population?
We are trying to find out if children below the age of 10 like ice cream A or ice cream B better. To do this, we split the children into groups by gender. We then pull an SRS from both groups to create our sample.
All Children Under 10
The two types of bias that may come from one going to a park and interviewing every other person they see and those people refusing to respond.
Convenience Sampling and Nonresponse
The type of treatment given to the units
The variable that is measured
Factor (Explanatory Variable)
Response Variable
What are the three types of experimental design
Completely Randomized, Randomized Block, and Matched Pairs
In order to have the best results possible, we use double blinding. What does this mean?
We are trying to find out if a new pill works best for treating a condition. We divide our samples into two and place one group on the new pill. The other group is then assigned to the old pill.
Neither the patients nor the evaluator know what treatment is being given