Mathematics · Probability and Statistics
If x and y are two variables with independent frequency distributions with means μ x and μ y and variances σ x 2 and σ y 2 , then the population variance of their difference σ x - y 2 is:
- 1μ x σ x 2 - μ y σ y 2
- 2μ x σ x 2 + μ y σ y 2
- 3σ x 2 - σ y 2
- 4σ x 2 + σ y 2✓
Correct answer
σ x 2 + σ y 2
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