A family takes 2 1/2 h to drive from their house to a lake at 48 mi/h at the beginning of summer. By the end of the summer, she can ride around the reservoir in 1 1/2 h. The time to travel around the reservoir varies inversely with the speed she pedals. What is her speed at the end of the summer?

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?