Chi square

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Two physicians examined  results of 50  randomized, double-blind, placebo-controlled trial

examining whether patients with chronic fatigue syndrome (CFS) improved

6 weeks after treatment with intramuscular magnesium. The group who received the magnesium

were compared to a group who received a placebo and outcome was feeling better.

Physician A believed 15 patients received magnesium as opposed to placebo. Physician B believed

20 patients received magnesium as opposed to placebo. They both agreed on 9 patient cases having received magnesium as opposed to placebo. What is the Chi square result?

    

Treatment

 

Outcome

 

 

Physician B - Magnesium

Physician B - Placebo

Total

Physician A - Magnesium

9

?

15

Physician A - Placebo

?

?

?

Total

20

?

50

 

 

 

    • 10 years ago
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