Cox et al. (1991) conducted a study to examine the effects
of intramuscular injections of magnesium on chronic fatigue syndrome. This was
a double-blind study also using a placebo (injection of saline solution). Six
hours after the injection, the patient was asked whether or not they felt
better. The following results were obtained:
Did not Feel Better
Analyze this table using a G-test of independence.
Include your row and column totals and your expected values as part of your
Now use Fisher’s exact test to analyze the data in the
table, and compare your results to those found using the G-test.
Which test (G-test or Fisher’s exact test) is most
appropriate for these data? Be sure to explain your reasoning.