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
Question 2
Which of the following situations would not typically need written consent from the participants and their families?
a. A researcher wants to interview tenth grade students about their study habits.
b. A researcher wants to administer a survey to middle school students about their television viewing at home.
c. A researcher wants to observe the natural play interactions of children on the playground in a public setting.
d. A researcher wants to give a short questionnaire to twelfth grade students about their extracurricular activities.
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