credit card debts of 100 families selected from a given city

credit card debts of 100 families selected from a given city. is it population or sample?

the percentage of all US registered voters in each state who voted in 2012 presidential election. is it population or sample?

Solution

(a)

A city has number of families who are having credit card debts.

All such families in a city form our population under study or consideration.

From all these families we have selected 100 families.

Hence these 100 families for a part of population and hence it is a sample.

(b)

Percentage of all US registered voters who voted in 2012, gives us a population of US registered voters who voted in 2012.

It is a population because all people who voted have been considered. We haven\'t just chosen few of them randomly..