Math Quiz 10/30

Statistics

the science of collecting, organziaing, and intereprting data

• are the data that describe or summarize someything

Population

the complete set of subjects being studied

Sample

subset of the population

• where raw data is collected

Random Sampling

choosing in a way such that there is an equal chance of being selected

• Ex. pulling names out of a hat

Systemic Sampling

selecting every #th member of the population

Ex, counting off, selecting that #

Convience Sampling

choosing a sample that’s convient to select

Ex. everyone in the class

Stratified Sampling

create subgroups, then draw a random sample from each subgroup

Ex. people with different majors

Observational

no action, just looking

Experimental

involves interaction

Treatment

gets treatment, action done

Control Group

gets nothing, is offered as a comparrsion to the treatment group

Placebo

lacks the active ingredients of a treatment being tested

Placebo Effect

improvement simply because they think they’re healing

Should you believe every statitical study?

1. Get a big picture of the study

2. Consider the source

3. Look for bias in the sample (selective, participation)

4. Look for problems in defining or measuring variables of interest