The strong ______ correlations between age and incidence of Alzheimer's disease found in many studies seem to indicate a 50% likelihood of getting Alzheimer's disease by age 85.
A) positive
B) negative
C) causal
D) predictive

Question

Quizplus · Accepted Answer

The word "strong" and the phrase "50% likelihood" suggest a positive correlation between age and incidence of Alzheimer's disease. Choice B (negative) is the opposite of this and not supported by the given information. Choice C (causal) suggests that age causes Alzheimer's disease, which is not necessarily the case. Choice D (predictive) is tempting, but since the correlation is with age and not other factors, it would be more accurate to say that age is a risk factor for Alzheimer's disease rather than a predictor of it.

The Strong ______ Correlations Between Age and Incidence of Alzheimer's