Nancy recorded the height (in centimetres) of her friends which gave the data 89, 77, 78, 95, and 89. She later added the heights of four more friends at 77, 78, 77, and 100. Which of the following statements is true? A
By adding the extra friends to the data set, the mode decreased, the median increased, and the mean decreased.
B
By adding the extra friends to the data set, the mode increased, the median decreased, and the mean increased.
C
By adding the extra friends to the data set, the mode increased, the median increased, and the mean increased.
D
By adding the extra friends to the data set, the mode decreased, the median decreased, and the mean decreased.

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?