2.4 - Finding Standard Deviation

Front

What is the first step in finding the sample standard deviation?

Back

Calculate the mean of the data set.

Front

What do you do with the mean when finding the standard deviation?

Back

Subtract the mean from each number in the data set.

Front

What do you do with the deviations after subtracting the mean?

Back

Square each deviation.

Front

What is the next step after squaring all the deviations?

Back

Add all the squared deviations together.

Front

How do you find the variance from the sum of squared deviations?

Back

Divide the sum of squared deviations by n-1.

Front

What is the final step in finding the sample standard deviation?

Back

Take the square root of the variance.

Front

What is the formula for variance in a sample?

Back

Variance = (Sum of squared deviations) / (n - 1)

Front

What is the difference between population standard deviation and sample standard deviation?

Back

Population standard deviation divides by N, while sample standard deviation divides by n-1.

Front

Why do we divide by n-1 instead of n when calculating sample variance?

Back

To correct for bias in the estimation of the population variance.

Front

What is a deviation in statistics?

Back

A deviation is the difference between a data point and the mean.