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Author Question: A Columbia University study linked soda consumption to behavior problems in children. Researchers ... (Read 195 times)

bb

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A Columbia University study linked soda consumption to behavior problems in children. Researchers examined data from a previous study that followed 2929 mother-child pairs.
 
  One survey asked about behaviors of the child and also about soda consumption. They found that the more soda the kids drank, the more behavior problems they had. What aspect of a well-designed experiment is absent from this study?
  A) a control group
  B) randomization
  C) blinding
  D) a placebo
  E) all of these

Question 2

In an experiment the primary purpose of blocking is to
 
  A) reduce the within-treatment variation.
  B) reduce the between-treatment variation.
  C) eliminate the need for random assignment of treatments.
  D) eliminate confounding variables.
  E) reduce bias.


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nekcihc358

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bb

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Reply 2 on: Jul 24, 2018
Thanks for the timely response, appreciate it


jackie

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Reply 3 on: Yesterday
Great answer, keep it coming :)

 

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