The combined mean of two groups depends on: MCQ with Answer and Explanation

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The combined mean of two groups depends on:

A. The individual means only

B. The individual means and the group sizes

C. The medians

D. The group sizes only

Answer: Option B

Solution (By JKExamLibrary)

Combined mean = (n₁x̄₁ + n₂x̄₂) / (n₁ + n₂).

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1 Report Error

The harmonic mean is the reciprocal of the arithmetic mean of:

A. Squares of observations

B. The observations themselves

C. Reciprocals of the observations

D. Square roots of observations

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Correct Answer: Option C

Explanation:
HM = 1 / [ (1/n) Σ (1/x_i) ].

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

The cost of living index is primarily used for:

A. Measuring agricultural output

B. Computing GDP

C. Adjusting salaries and wages

D. Forecasting exports

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Correct Answer: Option C

Explanation:
It measures changes in the cost of living, used to adjust dearness allowance and wages.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

Net Reproduction Rate (NRR) takes into account:

A. Fertility and mortality

B. Only fertility

C. Only mortality

D. Migration

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Correct Answer: Option A

Explanation:
NRR adjusts GRR for the mortality of women during reproductive ages; it indicates replacement level.

This question belongs to: Accountancy and Statistics Statistics

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