A researcher wishes to determine the required sample size for a study to test whether subjects who do not exercise have elevated serum uric acid levels. Prior data suggests that the standard deviation for uric acid is s=1.2 mg/dL. For an 0.05 level test of 0: = 5.4 / Against : 5.4 / How many observations are required to achieve a power of 0.9 for a margin of error of E = 5.8 /