19. Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally
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19. Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.65 and standard deviation
.85 (suggested in Modeling Sediment and Water Column Interactions for Hydrophobic Pollutants, Water Res., 1984: 1169—1174).
a. If a random sample of 25 specimens is selected, what is the probability that the sample average sediment density is at most 3.00? Between 2.65 and 3.00?
b. How large a sample size would be required to ensure that the rst probability in part
(a) is at least .99?
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Related Book For 
Modern Mathematical Statistics With Applications
ISBN: 9780534404734
1st Edition
Authors: Jay L Devore
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