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What points must be important to remember, when we deal with random noise calculations?

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What points must be important to remember, when we deal with random noise calculations?

(a) all calculations are based on peak to peak values

(b) calculations are based on quantised values

(c) calculations are based on average values

(d) calculations are based on RMS values

I have been asked this question during an online interview.

This question is from Noise in AM in chapter Noise of Analog Communications

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The correct choice is (d) calculations are based on RMS values

To explain I would say: All calculations of any random signals are done by using their RMS (Root Mean Square) values.

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