Dr Smith Is Conducting a Research Study on Age Differences

Multiple Choice

Dr. Smith is conducting a research study on age differences in intelligence. He assesses the intelligence of 5-, 10-, 15-, and 20-year-old participants on the same date and compares their results on an IQ test. What type of research is Dr. Smith conducting?

A) cross-sectional
B) longitudinal
C) correlational
D) naturalistic observation