Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

Exercise 98

z Scores: Red Bold Cell Count Let x = red blood cell (RBC) count in millions per cubic millimetre of whole blood. For healthy females, x has an approximately normal distribution with mean = 4.8 and standard deviation = 0.3 (based on information form Diagnostic Tests with Nursing Implications , edited by S. Loeb, Springhouse Press). Convert each of the following x intervals to z intervals.
(a) 4.5 x
(b) x 4.2
(c) 4.0 x 5.5
Convert each of the following z intervals to x intervals.
(d) z 1.44
(e) 1.28 z
(f) 2.25 z 1.00
(g) Interpretation If a female had an RBC count of 5.9 or higher, would that be considered unusually high Explain using z values and Figure 6-15.