## How do you calculate CD in statistics?

The CD can be expressed as a percent (CD%) or an absolute value in the measurement units of the analyte (CDu). These are related by CDu = CD% × A units, where A is the analyte concentration from which the CD will be determined.

## Can standard deviation be bigger than mean?

The answer is yes. (1) Both the population or sample MEAN can be negative or non-negative while the SD must be a non-negative real number. A smaller standard deviation indicates that more of the data is clustered about the mean while A larger one indicates the data are more spread out.

## What number is considered a high standard deviation?

For an approximate answer, please estimate your coefficient of variation (CV=standard deviation / mean). As a rule of thumb, a CV >= 1 indicates a relatively high variation, while a CV considered low.

## Is high standard deviation good or bad?

Basically, a small standard deviation means that the values in a statistical data set are close to the mean of the data set, on average, and a large standard deviation means that the values in the data set are farther away from the mean, on average.