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Qualitative Data
Describes qualities or nonnumerical categories

Quantitative Data
represents counts or measurements

Qualitative Data
Describes qualities or nonnumerical catagories: Not numbers

Population
In a statistical study is the complete set of people or things being studied.

Sample
Is the subset of a population from which the raw data are actually obtained.

Population Parameters
Are the specific characteristics of the population that a statistical study is designed to estimate

Sample Statistics
Are numbers or observations that summarize the raw data.

Representative Sample
Is a sample in which the relevant characteristics of the sample members match those of the population.

Simple Random Sampling
Sampling method that randomly chooses subjects w/ no order or specific criteria

Systematic Sampling
Sampling Method that uses a method or specific way to choose the subjects

Convenience Sampling
Sampling method that uses convenince in choosing its subjects.

Stratified Sampling
Sampling Method that chooses a subset with in a subset

Observational Study
1 of 2 different study methods. Based on observation. No contact. No affecting population.

Experiment
1 of 2 study methods: Apply treatment to some or all the members of a study.

Treatment Group
the group that receives treatment in an experiment study

Control Group
The group that does not receive treament in an experiment study. May get a placebo.

Placebo
Fake treatment. example: sugar pill

Placebo Effect
False effects. All in your mind. Because you received a treatment, you believe you feel the effects.

Single Blind
An experiment when the participants do not know whether they are members of the treatment or the control group, but the experimenters do.

Double Blind
An experiment when neither the participants nor the experimenters know who belongs to the treatment or control groups.

Case Control Study
An observational studay that resembles an experiment because the sample naturally divides into 2 or more groups.

Statistics
statistics
The science of statistics which helps us collect, organzie and interpet data
(are the data that describe or summarize something)

