using a G-test of independence

Dec 3rd, 2015
Sigchi4life
Category:
Statistics
Price: $25 USD

Question description

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:

                                  Magnesium      Placebo

Felt Better

12               

3                

Did not Feel Better

3

14


A)  Analyze this table using a G-test of independence. Include your row and column totals and your expected values as part of your answer.

B)  Now use Fisher’s exact test to analyze the data in the table, and compare your results to those found using the G-test.

C)  Which test (G-test or Fisher’s exact test) is most appropriate for these data? Be sure to explain your reasoning.


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