If a researcher watches one-week-old babies and records how many times they open and close their eyes while lying in their cribs, he is most likely using:
the case-study method.
a controlled experiment.
cross-sectional research.
scientific observation.
Question 2
If a scientist wanted to use scientific observation to see how frequently schoolchildren share food at lunch, she could:
give half of them candy and see how many would share.
mingle with the children and ask them about sharing.
bring a small group into her laboratory and observe them eating.
watch the children from an unobtrusive spot in the school lunchroom.