Final answer:
Owning a second vehicle is a categorical variable because it classifies individuals into categories without involving numerical measurement. Duration is a quantitative continuous variable, while the number of times per week is a quantitative discrete variable.
Step-by-step explanation:
The question 'They own a second vehicle is what type of variable?' refers to identifying whether owning a second vehicle is a categorical, numerical, discrete, or numerical, continuous variable. This type of question falls under the topic of identifying variable types in statistics, a branch of mathematics.
In this context, owning a second vehicle is a categorical variable because it places an individual into one of two categories: those who do own a second vehicle and those who do not. This variable is about classification and not a numerical measurement which would be needed for it to be considered numerical (either discrete or continuous).
As for the provided references, other examples would be:
- Duration (amount of time) is quantitative continuous data because it can take on any value within an interval and is measured.
- Number of times per week is quantitative discrete data since it involves counting occurrences.
- The sampling method described is systematic because the question mentions a procedure that involves selecting every eighth house.