Sampling
A sample in which each set of n elements in the population has an equal chance of selection
What is Simple Random Sample (SRS)
Occurs when some members of the population don't an equal chance of selection.
What is undercoverage?
Control, Randomize, replicate, and comparison
What are principles of Experimental Design
A treatments know to have no effect, administered to one group so that all groups experience the same condition.
What is placebo?
A subset of a population, examined in hope of learning the population.
What is a sample?
Allows people to choose to be in the sample by responding to a general invitation
What is voluntary response Sampling
Any systematic failure of a sampling method to represent its population
What is bias?
A common form of randomized block design for comparing two treatments
What is Matched pair design?
It manipulates factor levels to create treatments, randomly assign subjects to these treatment levels, then compare response to the subject groups.
What is an experiment?
The entire group of individuals or instances about whom we hope to learn.
What is population?
A sampling design in which entire groups are chosen at random.
What is Cluster Sampling
Occurs when a an individual chosen for the sample can't be contacted or refuses to participate.
What is non-response Bias?
This is done to reduce the effect of identifiable attributes of the subjects that can be controlled.
What is blocking?
The process, intervention, or other controlled circumstances that is applied to randomly assigned experimental units.
What is a treatment?
A study based on data in which no manipulation of factors has been employed.
What is an Observational Study?
A sample drawn by selecting individuals systematically from sampling frame.
Occurs when there is systematic pattern of inaccurate answers to a survey question.
What is response bias?
The experimental units assigned to a baseline treatment level, typically either the default treatment, which well understood, or a null, placebo treatment
What is Control Group?
A variable whose levels are manipulated by the experimenter
What is a factor?
A sample that consist of the entire population
What is a Census?
A sampling design in which the population is divided into subpopulations and random samples are drawn from each.
What is stratified random Sample
Participants are assigned to a treatment group by chance alone.
What is randomization?
The sequence of several components representing events that we are pretending will take place.
What is a Trial?
Individuals on whom an experiment is performed. Usually subjects of participants when they are human?
What are experimental units?
Occurs when 2 variables are associated in such a way that their effects on a response variable cannot be distinguished from each other.
What are Confounding Variables?