Standard Deviation & Variance

Question 1

What does standard deviation measure?

Answer 1

• Measure of spread
• It tells you the average distance or deviation from the mean & takes into account all of the data

Question 2

What does variance measure?

Answer 2

The average degree to which each squared point differs from the mean

Question 3

Standard deviation formula

Question 4

Variance formula

Question 5

How do you use standard deviation to find anomalies/outliers?

Answer 5

Multiply your standard deviation by 2 and add & subtract it from the mean. Everything above and below are anomalies/outliers.