Sampling
Every group has an equal chance of selection.
What is SRS?
The subject does not know what treatment they are getting.
What is a single-blind experiment?
Poll results from only those who choose to call in.
What is Voluntary Response?
The entire group we want information about.
What is Population?
A study that attempts to reach every member of the population.
What is a Census?
Divide into homogenous groups, then SRS from each.
What is Stratified random sample?
Subjects don't know treatment; evaluators don't either.
What is double blind?
Parts of the population are left out of the sampling frame.
What is Undercoverage?
A numerical summary of a population.
What is a Parameter?
Required to establish a "Cause-and-Effect" relationship.
What is Random Assignment?
Divide into heterogeneous groups, then select entire groups.
What is cluster sampling?
Specific type of block design comparing two treatments per unit.
What is Matched Pairs?
When selected people refuse to participate in the survey.
What is Non-Response?
Variable whose levels are manipulated in an experiment.
What is Explanatory?
Required to generalize results to a larger population.
What is Random Selection?
Started randomly, then every k-th sample is taken.
What is systematic random samplev
A fake treatment given to the control group.
What is a Placebo?
Lying or providing false info to a surveyor.
What is Response Bias?
A variable related to explanatory that affects the response.
What is Confounding?
If subjects aren't randomly chosen, results only apply to these __________.
Who are Volunteers?(Or any synonym like those specific subjects)
An unbiased estimator is a statistic whose __________ distribution's mean is equal to the parameter
What is Sampling?
Used to reduce variation in the response variable.
What is Blocking?
A question that contains too much information, making it hard to answer
What is a Loaded Question?
When an observed result is too large to be chance alone.
What is Statistically Significant?
The type of study that uses neither random selection nor assignment.
What is an Observational Study?