Gina hypothesizes that wearing eye make-up (versus not) will lead to more smiles received from people passing by. To control for baseline attractiveness ratings, zhe has the same female research assistant wear the same clothes for a one-hour period at the same time of day on two successive days and smiles at people who pass her, only varying whether or not the assistant is wearing eye make-up. Zhe then compares the percent of passersby who smile at the assistant in the make-up versus non-make-up condition. In this example, the hypothesis is ___________ and should be tested with a _____________ test