Variables
A very simple visual display to show two quantitative variables simultaneously.
What is a scatterplot?
The degree to which two (2) variables are associated.
What is the correlation coefficient?
A study where the investigator recounts instances known to him or her.
What is an anecdote?
The symbol for the mean in a sample.
What is "x bar"?
The entire group of people or objects of interest to an investigator.
What is the population?
Plays a crucial role in experiments by aiming to balance out potential effects of lurking variables.
What is randomization?
The weakest correlation coefficient.
What is zero (0)?
Choosing the first 5 students that enter the room to answer survey questions.
What is a Convenience Sample?
The symbol for a proportion in a sample.
What is "p hat"?
A numerical characteristic of a population.
What is a parameter?
A variable that is not being measured, but the two variables being measured are related to it.
What is a lurking or confounding variable?
The name of the variable that comes AFTER "vs" in "y" vs "x".
What is the explanatory (predictor) variable?
Asking for volunteers to complete a survey.
What is a Voluntary Response Sample.
A numerical characteristic of a sample.
What is a statistic?
The symbol for the mean in a population.
What is mu?
A variable whose effect one wants to study.
What is an explanatory (predictor) variable?
The best two indicators of a good fitting line. (You must name at least one.)
What are residuals and r2?
When a simple random sample is performed after there are groups formed.
What is a Stratified Random Sample?
The investigator just observes and records data on the observational units.
What is an Observational Study?
Wildlife management experts use this to determine an estimate of a population of species.
What is the Capture-Recapture Method?
A variable whose effects on the response variable are indistinguishable for those of the explanatory variable.
What is a confounding variable?
A scatterplot to show whether or not a straight line (linear model) is a reasonable fit for the data.
What is a residual plot?
Every subset of the population has the same chance to be in the sample.
What is a Simple Random Sample?
The investigator imposes some condition on the subjects, then observes and records the results.
What is an Experiment?
Samples of a population that overrepresent certain segments of the population and underrepresent others.
What are biased samples?