Serum ferritin is employed in diagnosing iron deficiency., Ask an Expert

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Serum ferritin is employed in diagnosing iron deficiency. In study conducted recently researchers discovered that in the sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6 mg/L. For 26 younger men sample standard deviation was 84.2 mg/L. At the .01 level of significance, do such data support the conclusion that the ferritin distribution in elderly men has the smaller variance than in younger men?

A. No, because test value 1.60 is less than the critical value of 2.54

B. Yes, because test value 2.56 is greater than the critical value of 2.54

C. Yes, because test value 0.390 is less than the critical value 2.54

D. Yes, because test value 2.56 is greater than the critical value 0.394

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