The figure below shows a shaded rectangle inside a large rectangle: a rectangle of length 10 units and width 5 units is shown. inside this rectangle is another rectangle of length 9 units and width 3 units placed symmetrically inside the larger rectangle. the smaller rectangle is shaded gray. if you choose a point inside the large rectangle, what is the probability that it is not inside the shaded rectangle?

Stu and ambrose are working together on a study of whether diet is related to students' mental health. first, they randomly select 10 students from the student center and 10 students from the office of counseling and psychological services. then, they ask students to rate their diet in terms of healthiness on a scale of 1-100 before completing a 20-item mental health survey. a) name one of the constructs being studied b) how was the construct you named above operationally defined in this experiment? e) was the variable you described above their independent variable, their dependent variable, or a controlled variable? d) what is a confounding variable? what is a potential confound in this study?