★ Must-know
📌 Variables are categorical (nominal or ordinal) or numerical, with numerical variables classified as discrete or continuous.
Further detail
📌 A discrete numerical variable has a finite or countably infinite range, whereas a continuous variable is modeled as having an uncountable range.
A population is the full group; a sample is only a subset.
1. A researcher is studying the heights of students at a university. What is the population in this study?
2. A survey measures the commuting times of 200 employees chosen from a company of 3,000 employees. What are the 200 chosen employees?
3. In a study of household electricity use, what is the statistical variable if the researcher records each household’s monthly consumption?
What is a population in statistics?
The set of individuals or objects being studied.
What is a sample in statistics?
A subset of the population.
What is a statistical variable?
A characteristic or property of interest of a population.
How are statistical variables broadly classified?
As categorical or numerical.
What are the two types of categorical variables?
Nominal and ordinal.
How are numerical variables further classified?
As discrete or continuous.
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