Three officers—a president, a treasurer, and a secretary—are to be chosen from among four people: ann, bob, cyd, and dan. suppose that bob is not qualified to be treasurer and cyd’s other commitments make it impossible for her to be secretary. how many ways can the officers be chosen? can the multiplication rule be used to solve this problem?

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?