Emile works in a factory monitoring and recording the weight of molded metal parts. He complies the data each week and reports the mean and range of the collected data. Which of these BEST compares these two values? A: The mean and range summarize the data set.
B: The mean and the range both describe how the data varies.
C: The mean describes how data varies while the range summarizes the data set.
D: The mean summarizes the data set while the range describes how the data varies.

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?