Sampling
People who volunteer to be in a sample. This is biased.
Voluntary Response Sample
Individuals selected for a sample cannot be reached.
Nonresponse
The group of people who are given a placebo.
Control group
All experimental units are assigned to all of the treatments at random.
Completely randomized
Faith Christian School was founded during this year.
1993
Choosing individuals who are easy to reach.
Convivence Sampling
A group of the population is left out of the process when choosing a sample.
Undercoverage
A dummy treatment used to see if something works. Looks the same as the real treatment.
Placebo
When experimental units are separated by a common characteristic before being randomly assigned to treatments.
Block Design
Type of experiment when neither the subject nor the experimenter knows who has the treatment
Double-blind experiment
Divide population into group, perform a simple random sample in each group.
Stratified Random Sample
The respondent or interviewer cause the questions to be dishonest.
Response bias
When an observed outcome is too large to occur by chance.
Statistically significant
Only two treatments done, each group gets both treatments
Matched pair design
What is being measured and used for comparison.
Response variable
Gives each person in a population an equal chance to be selected.
SRS
Wording of the questions or choices cause the respondent to be confused or mislead.
Wording effect
Three principles of experimental design
Control, randomization, replication
Applies a treatment to obtain a result. Observes the subject response when the treatment is administered.
Experiment
Specific values of a treatment
Level
Forms groups that are closely located and mirror the population, then samples the whole group that is randomly selected
Cluster Sample
This happens when lurking variables are not controlled and cause/effect can no longer be determined
Confounding
These are two challenges faced when trying to establish causation.
Lack of realism
Lack of practicality
Observes people and measures the variables of interest.
Observational study
These three high school teachers all graduated with bachelor's degrees from NC Wesleyan.
Mr. Carter, Mrs. Oskiera, and Mr. Smith