The Hypothesis Test feature allows you to run a relevant statistical test on your dataset, whether or not you have already made a visualization / graph. Start by selecting Hypothesis Test in the left-hand menu of your dataset view:

The list of possible tests shows you what your options are. Any tests that can't be run at all on your dataset due to requiring too many variables of a given type will be greyed out, with an explanation:

Clearly, you need to have set the types for your columns before this can be used.
Then you can select the variables you want to use for the test:

Then clicking Calculate will execute the actual test and you can see the results:
