1. Children who read every day have a significantly higher vocabulary than children who do not read every day.

2. There will be a difference in hours slept each night according to type of anti-depressant (e.g. drug X, drug Y, drug Z).

3. Adults with a college degree will have a significantly higher annual income than adults who do not have a college degree.

Can you identify the IV and DV in each of these hypotheses?