Researchers studied the effects of vitamin supplements on the health of over 600 city residents throughout their adulthood. This research procedure best illustrated a

Question

Quizplus · Accepted Answer

The best choice is D, longitudinal study. This is because the study followed the same group of individuals throughout their adulthood, allowing researchers to observe changes and trends over time. A cross-sectional study (B) would involve looking at different groups of individuals at a single point in time, while a scatterplot (C) would involve plotting two variables to look for a correlation. Regression toward the mean (A) refers to the tendency for extreme scores on a variable to move closer to the average on subsequent measurements, and is not applicable in this case.

Researchers Studied the Effects of Vitamin Supplements on the Health