Statistical Study
A researcher observes and measures characteristics or interest of part of a population but does not change existing conditions.
What is Observational Study?
Divide members of population into groups based on strata, or a shared characteristic.
What is a Stratified Sampling?
A variable where no data is collected but has influence on the study. You could say it is in the background.
What is Lurking Variable.
Qualitative only. Data can be categorized using names, labels, or qualities.
What is Nominal Measurement?
The collection of all outcomes, responses, measurements, or counts that are of interest.
What is Population?
In this study, treatment is applied to part of a population and responses are observed.
What is Experiment?
Numbering members sequentially and then taking every kth person.
What is Systematic Sampling?
Occurs when a subject reacts favorably to a placebo when in fact the subject has been given a fake treatment.
What is The Placebo Effect.
Are qualitative or quantitative. Data can be arranged in order, or ranked.
What is Ordinal Measurement?
Is a subset, or part, of a population.
What is a Sample?
A group where no treatment is applied
What is Control Group?
Using a variety of sampling methods to create small groups.
What is Multistage Sampling?
This helps reduce the possibility that the data happened by chance alone. You use a lot of people in an experiment rather than only a few. (this means the experiment is replicated multiple times)
What is Replication?
Measurement where data can be arranged in order and differences between the values are meaningful. For example: time of first class
What is Interval Measurement?
A numerical description of a population characteristic.
What is a Parameter?
A harmless, fake treatment, that is made to look like the real treatment.
What is Placebo?
One in which every member of of the population has an equal chance of being selected.
What is Random Sample?
Neither the experimenter nor the subjects know if the subject are receiving a treatment or a placebo.
What is Double-blind Experiment?
Similar to data at the interval level, but differences between data and ratios of data values are meaningful. For example: Score on last exam
What is Ratio Measurement?
A numerical description of a sample characteristic.
What is a Statistic?
This is used to assign individuals to two treatment groups. This helps prevent bias in selecting members.
What is Randomization?
A sample created by data collected by other people. They may not have done a good job.
What is Convenience Sampling?
Groups of subjects with similar characteristics.
What are Blocks?
Measurement associated with the following example: Length of time to complete an exam
What is Ratio?
Consists of information coming from observations, counts, measurements, or responses.
What is Data?