You are interested in looking at the relationship between stress and the number
ID: 3299952 • Letter: Y
Question
You are interested in looking at the relationship between stress and the number of gray hairs. There are potentially a number of different ways/data sets to get at this research question. Which of the following would be observational studies and which of the following would be experimental?
(a) You stand outside a barbershop and observe people as they walk in, noting the general amount of gray in each person’s hair. As they exit, you ask them to rate the general level of stress in their lives.
(b) You also happen to teach two nighttime statistics classes. One meets on Mondays and Wednesdays, while the other meets on Tuesdays and Thursdays. For the MW class, you assign very hard homework problem and test questions. For the TR class, you give much easier questions.
(c) You download all the LinkedIn photos you can find. For each photo, you can kind of spot the general amount of gray hairs. Their LinkedIn profiles also tell you about their current and previous jobs. From each job, you impute a “stress index” based on a business survey of workers in each industry.
Explanation / Answer
(a) You stand outside a barbershop and observe people as they walk in, noting the general amount of gray in each person’s hair. As they exit, you ask them to rate the general level of stress in their lives.
Answer:-Observational Studies.
(b) You also happen to teach two nighttime statistics classes. One meets on Mondays and Wednesdays, while the other meets on Tuesdays and Thursdays. For the MW class, you assign very hard homework problem and test questions. For the TR class, you give much easier questions.
Answer:-Experimental Studies.
(c) You download all the LinkedIn photos you can find. For each photo, you can kind of spot the general amount of gray hairs. Their LinkedIn profiles also tell you about their current and previous jobs. From each job, you impute a “stress index” based on a business survey of workers in each industry.
Answer:-Observational Studies
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