STT 215 PRACTICE TEST
Population - ANSWER -The entire group of individuals or objects of interest
Sample - ANSWER -Subset of the population on which information is
obtained
Census - ANSWER -When the sample is the entire population
Response Rate - ANSWER (# of response)/(sample size)
Experimental Units - ANSWER -Called subjects for human beings
-Individual on which experiment is done
Treatment - ANSWER -Aka factor
-Specific experimental condition e.g. a certain real medicine
Placebo - ANSWER -False treatment to control for psychological effects e.g.
sugar pills
Response Variable - ANSWER -Variable that measures the outcome of the
study
Explanatory variable - ANSWER -Aka factors
-Variable(s) that explains or causes changes in the response variable
Double blind experiment - ANSWER -Neither the subjects nor the evaluators
should know who was in the control group
-Subjects should be assigned randomly
Observational Study - ANSWER -the investigator observes individuals and
measures variables of interest but does not attempt to influence the response
Experiment - ANSWER -Aka study
-The investigator observes how a response variable behaves when the researcher
manipulates one or more factors
Population - ANSWER -The entire group of individuals or objects of interest
Sample - ANSWER -Subset of the population on which information is
obtained
Census - ANSWER -When the sample is the entire population
Response Rate - ANSWER (# of response)/(sample size)
Experimental Units - ANSWER -Called subjects for human beings
-Individual on which experiment is done
Treatment - ANSWER -Aka factor
-Specific experimental condition e.g. a certain real medicine
Placebo - ANSWER -False treatment to control for psychological effects e.g.
sugar pills
Response Variable - ANSWER -Variable that measures the outcome of the
study
Explanatory variable - ANSWER -Aka factors
-Variable(s) that explains or causes changes in the response variable
Double blind experiment - ANSWER -Neither the subjects nor the evaluators
should know who was in the control group
-Subjects should be assigned randomly
Observational Study - ANSWER -the investigator observes individuals and
measures variables of interest but does not attempt to influence the response
Experiment - ANSWER -Aka study
-The investigator observes how a response variable behaves when the researcher
manipulates one or more factors
