Random Questions
A table used to approximate randomness.
What is the Random Number Table?
To draw conclusions about the long-run behavior of a random event.
What is the purpose of a simulation?
A variable which is changed to produce an outcome.
What is an independent variable?
Every possible sample of the size collected should have the same chance of being selected.
What is a simple random sample (SRS) ?
Not everyone who is invited to respond to a survey responds.
What is voluntary response bias?
The best way we know to generate data that gives a fair and accurate picture.
What is randomness?
This models the outcomes of simulated random events.
What is a simulation?
Another term for dependent variable.
What is a response variable?
Not really a sample, includes everyone in the population.
What is a census?
People who don’t respond to a survey may differ in some important way from those who do respond.
What is nonresponse bias?
Statisticians use randomness as this.
What is a tool?
A sequence of events that we are pretending will take place.
What is a trial?
The group which we are trying to draw conclusions about.
What is the population?
First divide the population into groups, then perform SRS in each group.
What is a stratified random sample?
When some portion of the population is not sampled at all.
What is undercoverage?
A word used to show that computers are never truly random.
What is pseudorandom?
Used to reduce errors and increase the accuracy of a simulation.
What is a large sample size?
A set of two or more variables which could all have an effect on the outcome of a test, but we do not know which of the variables causes the change.
What are confounding variables?
First divide the population into groups, then select one group and only sample that cluster.
What is a cluster sample?
When something in the survey design influences the response such as poorly worded questions.
What is response bias?
Humans are bad at this.
What is picking things at random?
Something that must be stated after every test, simulation, and experiment.
What is a conclusion?
The subset of the population we decide to do our research on.
What is the sample?
Begin by randomly selecting an individual from the list and then choose a method for picking each subsequent individual.
What is a systematic sample?
Collecting data via the Internet is an example, as is calling people or collecting data at shopping malls.
What is convenience sampling?