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AP Statistics
Unit 4 – Probability, Random Variables, and Probability Distributions
Topic 4.9
If X and Y are two independent random variables, and Z = X - Y, what is the variance of Z?
SD(X)^2 - SD(Y)^2
SD(X) + SD(Y)
SD(X)^2 + SD(Y)^2
√(SD(X)^2 + SD(Y)^2)
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AP Statistics - 4.9 Combining Random Variables
Key terms
Independent Random Variables
Variance
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Cram Mode
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© 2024 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.
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