What is standard deviation?
Q: What is standard deviation?
A: Standard deviation is a number used to tell how measurements for a group are spread out from the average (mean or expected value).
Q: What does a low standard deviation mean?
A: A low standard deviation means that most of the numbers are close to the average.
Q: What does a high standard deviation mean?
A: A high standard deviation means that the numbers are more spread out.
Q: How is standard deviation used in money?
A: In money, the standard deviation on interest earned shows how different one person’s interest earned might be from the average.
Q: When can only part of a group be measured?
A: Many times, only a sample, or part of a group can be measured.
Q: How is the whole group's standard deviation represented?
A: The whole group's standard deviation is represented by the Greek letter σ {\displaystyle \sigma } .
Q: How is the sample's standard deviation represented?
A: The sample'sstandard devation is represented by s {\displaystyle s} .
