[Python] Can't import statsmodels in Jupyter even though it is already installed?

I've installed statsmodels using pip in a terminal. It was successful. But then I couldn't import statsmodels in the notebook. I also tried running !pip install statmodels in the notebook itself. I got:

Requirement already satisfied: statsmodels in /Library/Python/2.7/site-packages


But am still unable to import it.

import statsmodels as sm
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-4-dd062a96f652> in <module>()
----> 1 import statsmodels as sm


Am I missing a step?

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