A school nurse wants to know if children's knowledge about nutrition increases over the course of the elementary years. To find out, she gives a test about nutrition to students in the first, third, and fifth grades. She then compares the test scores for the three grade levels. Which one of the following research designs does the nurse's study best reflect?
A) experimental design
B) longitudinal design
C) cross-sectional design
D) correlational design
Correct Answer:
Verified
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