The standard deviation and the variance

As mentioned in the video, the standard deviation is the square root of the variance. You will see this for yourself by computing the standard deviation using np.std() and comparing it to what you get by computing the variance with np.var() and then computing the square root.

This exercise is part of the course

Statistical Thinking in Python (Part 1)

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Exercise instructions

Compute the variance of the data in the versicolor_petal_length array using np.var() and store it in a variable called variance.
Print the square root of this value.
Print the standard deviation of the data in the versicolor_petal_length array using np.std().

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Compute the variance: variance


# Print the square root of the variance


# Print the standard deviation

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