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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
20
50
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