# What is standard deviation math?

## What is standard deviation math?

The **Standard Deviation** is a measure of how spread out numbers are. Its symbol is σ (the greek letter sigma) The formula is easy: it is the square root of the **Variance**.

## Do you want a high or low variance?

**Low variance** is associated with **lower** risk and a **lower** return. **High**-**variance** stocks tend to be good for aggressive investors who **are** less risk-averse, while **low**-**variance** stocks tend to be good for conservative investors who have less risk tolerance. **Variance** is a measurement of the degree of risk in an investment.

## How do you do variance?

**The Many Ways We Use Variance**

- We calculate
**variance**by first calculating the mean of the data, then summing the square of the differences and dividing by the number of data points. ... - Once we calculate the sample
**variance**, we often are interested in the population**variance**, thus calculate a confidence interval.

## How do I calculate variance?

**How to Calculate Variance**

- Find the mean of the data set. Add all data values and divide by the sample size n.
- Find the squared difference from the mean for each data value. Subtract the mean from each data value and square the result.
- Find the sum of all the squared differences. ...
**Calculate**the**variance**.

## How do I find the difference between two numbers in Excel?

**Calculate the difference between two numbers** by inputting a **formula in a** new, blank cell. If A1 and B1 are both numeric **values**, you can use the "=A1-B1" **formula**. Your cells don't have to be **in the** same order as your **formula**. For example, you can also use the "=B1-A1" **formula** to **calculate** a different value.

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