This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Why, in the absence of any other evidence, can't you use data from an observational study to ... (Read 78 times)

Davideckstein7

  • Hero Member
  • *****
  • Posts: 555
on: Jul 24, 2018
Why, in the absence of any other evidence, can't you use data from an observational study to establish a causal link between two measurement variables?

Question 2

Suppose two measurement variables are legitimately related or correlated; does this imply that there is a causal connection between them? Explain why or why not.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

joewallace

  • Sr. Member
  • ****
  • Posts: 337
Reply #1 on: Jul 24, 2018
Answer to Question 1

THE SUBJECTS ARE NOT RANDOMLY ASSIGNED TO TREATMENTS; THERE COULD BE CONFOUNDING VARIABLES.

Answer to Question 2

NO. IT DEPENDS ON HOW THE DATA WERE COLLECTED.


Davideckstein7

  • Hero Member
  • *****
  • Posts: 555
Reply #2 on: Jul 24, 2018
Thanks


joewallace

  • Sr. Member
  • ****
  • Posts: 337
Reply #3 on: Jul 24, 2018
Welcome :)


« previous next »
 

Did you know?

Illicit drug use costs the United States approximately $181 billion every year.

Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

Did you know?

Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Did you know?

Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

Did you know?

Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Pocket gophers and ecosystem structure (data from Huntly and Inouye 1988). Pocket gophers and ecosystem structure (data from Huntly and Inouye 1988).
Biology deals with the study of the many varieties of living organisms. Biology deals with the study of the many varieties of living organisms.
A health history is essential in collecting subjective data about metabolic acidosis. A health history is essential in collecting subjective data about metabolic acidosis.
The study of how traits such as flower color are passed from generation to generation provided the m The study of how traits such as flower color are passed from generation to generation provided the m
Chi-Square Analysis of Mendel's Data Chi-Square Analysis of Mendel's Data
Satellite data on primary productivity in the equatorial Pacific Ocean Satellite data on primary productivity in the equatorial Pacific Ocean
Video: Requirements for nervous signals

For a complete list of videos, visit our video library