The 90% confidence level = .10, t turn the tables on df = 20 -1 = 19 at = 0.05 to = 1.73.
formulas instead of n = 20 instead of = 1.5 instead of s = 0.5 represent the beliefs it 90% of the average serum creatinine levels of workers in this plant. Ranged from 1.307 to 1.693
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