How is historical trading-day volatility measured?
###### Image credit: Google Finance

Step 1:

A) Calculate the absolute change in closing prices as the data set.

B) Calculate the percentage change in closing prices as the data set.

Step 2:

C) Calculate the standard deviation of the data set.

D) Calculate the variance of the data set.

Step 3:

E) Multiply it by \( \sqrt{ 260} \).

F) Multiply it by \( \sqrt{365} \).

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