Which of the following observations is an example of a positive correlation?
A)When a population consumes more fruits and vegetables,the percentage of people in that population with scurvy decreases.
B)When teenage girls increase their intake of iron-rich foods,the percentage of the girls who have iron-deficiency decreases.
C)When older adults increase their daily intake of vitamin D,the percentage of the adults that develops infections decreases.
D)When a group of 6-year-old children increase their physical activity level to 60 minutes a day,the children's muscle mass increases.

Question

Quizplus · Accepted Answer

This observation shows a positive correlation between increased physical activity and increased muscle mass in 6-year-old children. As the physical activity level of the children increased, their muscle mass increased as well.

Which of the Following Observations Is an Example of a Positive