Standard deviation

1. What a standard deviation means?
2. What is standard deviation used for?
3. What does 1 standard deviation mean?
4. What does this standard deviation tell you?

What a standard deviation means?

A standard deviation (or σ) is a measure of how dispersed the data is in relation to the mean. Low standard deviation means data are clustered around the mean, and high standard deviation indicates data are more spread out.

What is standard deviation used for?

Standard deviation tells you how spread out the data is. It is a measure of how far each observed value is from the mean. In any distribution, about 95% of values will be within 2 standard deviations of the mean.

What does 1 standard deviation mean?

What does 1 SD (one standard deviation) mean. On a bell curve or normal distribution of data. 1 SD = 1 Standard deviation = 68% of the scores or data values is roughly filling the area of a bell curve from a 13 of the way down the y axis.

What does this standard deviation tell you?

The standard deviation is the average amount of variability in your data set. It tells you, on average, how far each score lies from the mean.