Math 5A and 5B Terms

statistics

the science of collecting, organizing, and interpreting data; is the data that describes or summarizes something

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 equal chance of being selected

systemic sampling

selecting every nth member of population (everyone in the population has equal chance)

convenience sampling

choosing a sample that is convenient to select

stratified sampling

create subgroups that draw a random sample from each subgroup

experimental: treatment group

people you actually conduct experiment on

experimental: control group

people you observe the natural behavior of and doesn’t receive the experiment

observational study

you’re observing, not touching and not giving anyone anything, just observing behavior and taking notes

placebo

lacks the active ingredients of the treatment being tested

placebo effect

improvement simply because they think they are healing

steps in statistical study

get a big picture of the study

steps in statistical study

consider the source

steps in statistical study

look for bias in the sample

steps in statistical study

look for problems in defining or measuring variables of interest