Which of the following observations is an example of a positive correlation?
A)When a population's vitamin D intake decreases,the percentage of people in the population that have healthy immune systems decreases.
B)When a population's intake of plant foods decreases,the percentage of obese people in that population increases.
C)When a population's level of vitamin C in white blood cells increases,the percentage of people in the population who develop scurvy decreases.
D)When a population's level of physical activity increases,the percentage of people who develop heart disease decreases.

Question

Quizplus · Accepted Answer

In a positive correlation, both variables move in the same direction. In choice A, as vitamin D intake decreases, the percentage of people with healthy immune systems also decreases, indicating a positive correlation.

Which of the Following Observations Is an Example of a Positive