. Identify whether each of the following is an observational study or an experiment, and explain how you know. If it is an observational study, specify whether it is retrospective or prospective, and explain how you know. If it is an experiment, specify whether it is blind, double-blind, controlled, and explain how you know. • Researchers are studying whether eating a small amount of dark chocolate every day affects resting heart rate. They measure the resting heart rate daily for a week before the beginning of the study, and daily for a week after the end of the study, which lasts six months. The researchers are not told ahead of time which participants are and are not eating dark chocolate. • A study tracks the long-term professional careers of students for ten years after they graduate from college. • A psychologist is determining what proportion of her patients with eating disorders experienced harmful body image narratives in childhood. . Clinical trials for a new blood pressure medication are determining which dosage is most effective. One group receives a placebo, one group receives the low dose, and one group receives the higher dose. Subjects are paired according to age and similar genetic profile, and are following a prescribed diet and exercise regimen. Neither the researchers nor the participants know which dosage any participant is receiving, if any.
. Identify whether each of the following is an observational study or an experiment, and explain how you know. If it is an observational study, specify whether it is retrospective or prospective, and explain how you know. If it is an experiment, specify whether it is blind, double-blind, controlled, and explain how you know. • Researchers are studying whether eating a small amount of dark chocolate every day affects resting heart rate. They measure the resting heart rate daily for a week before the beginning of the study, and daily for a week after the end of the study, which lasts six months. The researchers are not told ahead of time which participants are and are not eating dark chocolate. • A study tracks the long-term professional careers of students for ten years after they graduate from college. • A psychologist is determining what proportion of her patients with eating disorders experienced harmful body image narratives in childhood. . Clinical trials for a new blood pressure medication are determining which dosage is most effective. One group receives a placebo, one group receives the low dose, and one group receives the higher dose. Subjects are paired according to age and similar genetic profile, and are following a prescribed diet and exercise regimen. Neither the researchers nor the participants know which dosage any participant is receiving, if any.
Chapter13: Aquatic Structures And Equipment
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Observational Studies and Experiments
Explain why each of the following questions are best answered by an observational study or an
experiment. Use details such as sample availability, ethics, and lurking variables to support your choice.
• Does this nutrient-enhanced soil increase the average fruit size for apple trees planted in it?
• Is there an effect on brain development for babies exposed to this antidepressant during
pregnancy?
• Does this sound frequency, which is undetectable by human hearing, improve focus during studying?
. Do concussions cause memory loss?
Identify whether each of the following is an observational study or an experiment, and explain how you
know. If it is an observational study, specify whether it is retrospective or prospective, and explain how
you know. If it is an experiment, specify whether it is blind, double-blind, controlled, and explain how
you know.
• Researchers are studying whether eating a small amount of dark chocolate every day affects resting
heart rate. They measure the resting heart rate daily for a week before the beginning of the study,
and daily for a week after the end of the study, which lasts six months. The researchers are not told
ahead of time which participants are and are not eating dark chocolate.
• A study tracks the long-term professional careers of students for ten years after they graduate from
college.
A psychologist is determining what proportion of her patients with eating disorders experienced
harmful body image narratives in childhood.
. Clinical trials for a new blood pressure medication are determining which dosage is most effective.
One group receives a placebo, one group receives the low dose, and one group receives the higher
dose. Subjects are paired according to age and similar genetic profile, and are following a prescribed
diet and exercise regimen. Neither the researchers nor the participants know which dosage any
participant is receiving, if any.
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