Q1) Serum ferritin is used in diagnosing iron deficiency.  In study conducted recently researchers discovered that in sample of 28 elderly men sample standard deviation of serum ferritin was 52.6 mg/L.  For 26 younger men sample standard deviation was 84.2 mg/L. At.01 level of significance, do these data support conclusion that ferritin distribution in elderly men has smaller variance than in younger men?

i) No, as test value 1.60 is less than critical value of 2.54         

ii) Yes, as the test value 2.56 is greater than critical value of 2.54

iii) Yes, as the test value 0.390 is less than critical value 2.54

iv) Yes, as the test value 2.56 is greater than critical value 0.394

Q2) Lawyer researched average number of years served by 45 different justices on Supreme Court. Average number of years served was 13.8 years with standard deviation of 7.3 years.  What is 95% confidence interval estimate for average number of years served by all Supreme Court justices? 

Lower limit (first blank) = __________, Upper limit (second blank) = ___________.