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The formula we use for standard deviation depends on whether the data is being considered a population of its own, or the data is a sample representing a larger population.

You use it when you're finding the variance and only with a sample (vs. working with the universe, or all of the values.) The explanation is a little tricky to write, but if you're interested in knowing …

What is the average age of the bears at your zoo? What is the standard deviation? Round your answers to the nearest tenth.

The standard deviation formula may look confusing, but it will make sense after we break it down. In the coming sections, we'll walk through a step-by-step interactive example.

Practice calculating both sample and population variances.

The standard deviation formula may look confusing, but it will make sense after we break it down. In the coming sections, we'll walk through a step-by-step interactive example.

The range is easy to calculate—it's the difference between the largest and smallest data points in a set. Standard deviation is the square root of the variance. Standard deviation is a measure …

In population standard deviation is calculated using every individual from that population while in sample standard deviation we take specific number of individuals from the population.

We could take the square root of both sides of this and say, the standard deviation of the sampling distribution of the sample mean is often called the standard deviation of the mean, …