Emmmmm are you ok?????????
Direct information contains a bias in favor of that particular product or service.
A mixed-factorial design describes a study with:
an experimental variable and a subject variable.
more than 2 independent variables.
a between-subjects variable and a within-subjects variable.
a manipulated variable and a within-subjects variable.
a between-subjects variable and a within-subjects variable.
I think the correct answer is
The last statement
4) You do what you are supposed to do.