Question

The World Health Organization wishes to estimate the mean density of people per square kilometer, they...

The World Health Organization wishes to estimate the mean density of people per square kilometer, they collect data on 56 countries. Justify for full credit.

(a) Which of the followings is the variable?

(i) All countries in the world (ii) Density of people per square kilometer

(iii) Set of densities of people per square kilometer of all countries

(iv) Set of densities of people per square kilometer of 56 countries

(b) Which of the followings is the population?

(i) All countries in the world

(ii) Density of people per square kilometer

(iii) Set of densities of people per square kilometer of all countries (iv) Set of densities of people per square kilometer of 56 countries

Math   Statistics-And-Probability   
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Answer #1

a)ii) density of people per square kilometer.

We are interested in the measure, mean density of people per square kilometer, hence our variable of interest is the density of people per square kilometer.

b)iii) set of densities of people per square kilometer of all countries.

We are interested in the mean density of people per square kilometer and hence as a researcher we collect density of people per square kilometer of 56 countries which is a representative sample of the population mentioned above.

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