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
|