Two sets of observations assessing annual income and dental health are compared. Which of the following is most likely true?
A) The two variables will be both positively and negatively correlated.
B) The two variables will be uncorrelated.
C) The two variables will be negatively correlated.
D) The two variables will be positively correlated.

Question

Quizplus · Accepted Answer

It is likely that the two variables, annual income and dental health, will be positively correlated. This means that as income increases, so does dental health (such as the ability to afford dental care and healthier food choices). It is unlikely that the variables will be uncorrelated or negatively correlated, as there is some logical connection between income and dental health. It is improbable that the variables will be both positively and negatively correlated, as that would imply conflicting relationships between the two variables.

Two Sets of Observations Assessing Annual Income and Dental Health