The equation: s

=

p

2

−

p

2

s

=

p

2

-

p

2

gives the number of handshakes,

s

,

s

,

that would take place when

p

p

people gather in a room and every person in the room shakes the hand of every other person exactly once.

If there are 153 unique handshakes in the room, how many people are there?

There are people in the room.

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?