According to medical sciences research show that the average level of prothrombin in a normal population is 20 mg/100 ml of blood plasma with a standard deviation of 4 milligrams’/100 ml. To verify this, a sample is taken from 40 individuals in whom the average is 18.5 mg/100 ml. Can the hypothesis be accepted with a significance level of 5%? What are the extreme limits within which population average value can occur with 95% possibility?
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The mean level of prothrombin in the “normal” population is known to be 20.0 mg/100 ml of plasma and the standard deviation is 4 mg/100ml of plasma.
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