Honors Algebra 2- Vocab #1

Survey

A survey chooses a sample of a population and interviews them to collect desired data.

Self-Selected

Members of a population can volunteer to be in a sample.

Systematic

A rule is used to select members of a population, such as selecting every other person.

Convenience

Easy-to-reach members of a population are selected, such as those in the first row.

Random

Each member of a population has an equal chance of being selected.

Stratified

The population is first divided into groups. Then members are randomly chosen from each group.

Clustered

The population is first divided into groups. A sample of the groups is randomly chosen. All members of the chosen groups are surveyed.

Biased

Over represent or under represents part of the population.

Unbiased

Representative of the population you want information about.

Individual

People, animals, or objects that are described by data.

Variables

Characteristics used to describe individuals.

Treatment Group

Experiment group that recieves treatment.

Control Group

Experiment group that does not recieve treatment that is used for comparison

Experiment

An experiment investigates a cause-and-effect relationship between two variables. Participants are randomly assigned to two groups, one group gets treatment, the other doesn’t. Disadvantage is that it’s time consuming.

Observational

Involves a researcher measuring or oberserving something about participation in a sample without any intervention. You’re just observing, youre not affecting the result.

Controlled Experiment

Two groups are studied underconditions that are indentical except for one variable.

Randomized Comparative Experiment

Individuals are assigned to a group at random.

Sample Survey

A set of questions given to a group of participants. It can be over the phone, through email or face-to-face. Sample surveys also make inferences about the entire population.

Primary Data

Data that has bee collected directly by the researcher. The reseacher may use surveys, observational studies, or experimenets to collect data. Data is collected by YOU! Advantages are that its reliable, disadvantages is that its expensive and time consuming.

Secondary Data

Data previously collected by someone other man than the researcher. Data can from a national census or a study performed by someone else on a similar topic. Advantages include that its inexpensive and quick while disadvantages are that it may not be that reliable.

Ethical Data Collection

Involves ensuring any data collected is kept confidential and securly stored.

Data processing

Translatig raw data into useable information by cleaning and organizing it.