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In a clinical trial, patients suffering from severe migraines were randomly assigned to either a real surgery on migraine trigger sites or a sham surgery in which an incision was made but no actual procedure was done. Patients were asked whether or not they noticed a reduction in migraine headaches one month after the surgery, with the following results: Real Surgery Sham Surgery Reduction in Migraines 41 15 No Reduction 18 28 The analysis resulted in a test statistic = 12.03 and a p-value = 0.001. Write a full conclusion in context, citing the appropriate statistics, and calculate a relevant measure of effect size and interpret it in context