Solution

The $\textbf{population}$ contains all individuals/subjects about which we want to collect information.

A $\textbf{sample}$ is the part of the population of which information was actually collected.

The $\textbf{variables}$ are the topics that were investigated.

$\textbf{Categorical/qualitative}$ variables places the individuals into a category, while a $\textbf{quantitative}$ variable is a numerical variable.

SOLUTION

(a) The set of measurements contains data about ALL 38 deceased U.S. presidents and thus the set of measurements is a population.

(b) We are interested in the age at death for the U.S. presidents and thus the variable of interest is "Age at death".

(c) The age at death is quantitative, because the age takes on numerical values (for example, 78 years).

Answers

(a) Population

(b) Age at death

(c) Quantitative

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