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Classify the following scenarios as one$-$sided or two$-$sided tests.

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Test whether incoming students at a business school receive better grades in their classes if they$$ve taken an on$-$line program covering basic material

Test whether there is a difference between men$$s and women$$s usage of a mobile fitness app

Test whether the number of listeners of a streaming music service has changed after they changed the user interface

Test whether users of a commercial website are less likely to make a purchase if they are required to set up a user account on the site