Whether or not income is a possible confounding variable

Assignment Help Basic Statistics

Reference no: EM131411228

A news article on the Reuters Health website, December 18, 1998, reported that:

A study of over 1200 people over age 65 showed that the "owls"-those who go to sleep after 11 p.m. and rise after 8 a.m.-tend to be as healthy and intelligent as "larks"- those who go to bed before 11 p.m. and rise before 8 a.m.- according to a report in the December 19/26 issue of the British Medical Journal [Vol. 317, pp. 1675-1677]. The researchers also found that owls tend to have higher average income than the early birds.

a. Do you think this is based on an observational study or a randomized experiment? Explain.

b. It is mentioned that the "owls" have higher average income than the "larks" (early birds). Explain whether or not income is a possible confounding variable in this study.

c. Give an example of a possible confounding variable that is not mentioned.

d. Draw a figure similar to given Figure, illustrating the steps in this study.

1586_Fig 4.jpg

Reference no: EM131411228

Questions Cloud

What opportunities does change potentially generate : The structure below should be an examples, the overall layout does not need to be limited to this structure. As long as you speak it logically is enough.The reference and the PPT can be help to you, but beside the information you must refer other..

Black frontier experiences : How did the black frontier experiences compare with those of white compatriots?

What are the explanatory and response variables : Is this an observational study or a randomized experiment? Explain.- What are the explanatory and response variables?

What are some of the it innovations that have led : What are some of the IT innovations that have led to improved collaboration in business? Which do you think has been the most important and why?

Whether or not income is a possible confounding variable : It is mentioned that the "owls" have higher average income than the "larks" (early birds). Explain whether or not income is a possible confounding variable in this study.

What is the book value of manpower : Explain why there is a difference between the book value of Manpower and the amount you are willing to pay for it. What assumptions and/or principles of financial accounting are important here?

Derive the demand curve for the typical individual : Demand curve of medical care for a typical individual is given by the equation: M=10 -0.1 P + 0.002 Y + 0.12 A, Using the average values of income and age, Derive the demand curve for the "typical" individual

Union prepare for the war : 1. In 1860 the North had specific advantages over the South that helped the Union prepare for the war. Describe 4-5 of these advantages and show how they led to Union victory.

Which three rules do you consider most significant : Which three rules do you consider most significant, and which one do you believe is the least significant? In 250 to 300 words, describe why you have chosen your rules.

User Account

All Pages