The total population of a country at a given time is essentially affected by: MCQ with Answer and Explanation

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The total population of a country at a given time is essentially affected by:

A. Migration only

B. Fertility only

C. Fertility, Mortality, and Migration

D. Mortality only

Answer: Option C

Solution (By JKSSB Mock Tests)

These three components are the only demographic variables that determine changes in population size.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

Which of the following is an example of a 'schedule'?

A. A questionnaire filled by the respondent online

B. A postal survey

C. An enumerator records the answers of a household in a paper form

D. A ballot paper

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Correct Answer: Option C

Explanation:
A schedule is filled by the interviewer based on the respondent's answers.

This question belongs to: Accountancy and Statistics Statistics

Question #2

Bayes' theorem is particularly useful in:

A. Updating beliefs with new evidence in diagnostic testing or machine learning

B. Constructing frequency distributions

C. Calculating simple probabilities

D. Determining sample size

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Correct Answer: Option A

Explanation:
Bayes' theorem provides a formal framework for revising prior probabilities based on observed data, crucial in medical testing (e.g., disease probability given positive test) and Bayesian statistics.

This question belongs to: Accountancy and Statistics Statistics

Question #3

In demography, 'dependency ratio' is calculated as:

A. Urban population / Rural population × 100

B. Literates / Illiterates × 100

C. Births / Deaths × 100

D. (Population aged 0-14 + 65+) / Population aged 15-64 × 100

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Correct Answer: Option D

Explanation:
Dependency ratio = (Young dependents + Old dependents) / Working-age population × 100, indicating the economic burden on the productive population to support non-working groups.

This question belongs to: Accountancy and Statistics Statistics

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