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4. Forced Expiratory Volume (FEV, liters) was measured for a sample of 19 asthmatic patients. The following output gives summary statistics obtained using STATA: 2

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4. Forced Expiratory Volume (FEV, liters) was measured for a sample of 19 asthmatic patients. The following output gives summary statistics obtained using STATA: 2 . summarize fev, detail fov Percentiles Smallest 2 2 2 2. 4 10% 2 . 4 2.6 Obs 19 3. 2 Sum of Wgt. 19 50 4 Mean 3. 784211 Largest std. Dev. 8757619 75% 4.5 4.7 90% 4.7 4.7 Variance 766959 95% 5.2 4 . 7 Skewness 4285467 994 5. 2 5.2 Kurtosis 2.289203 a. What is the mean FEV? (6 pts.) b. What is the median FEV? (6 pts.) c. Compute the coefficient of variation (6 pts.). d. Present the range (6)ts (6 pts.)

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