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efi efi
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6 years ago
A clinical laboratory scientist performs 30 replicate hemoglobin determinations on a single blood sample. When statistics are used to determine the precision of the method, the mean is 13.8 g/dL and 1 SD is 0.1 g/dL.
 
  This means that 95.5 of the results on this specimen lie:
 
  a. Between 13.4 and 14.2 g/dL
  b. Between 13.6 and 14.0 g/dL
  c. Between 13.5 and 14.1 g/dL
  d. Between 13.7 and 13.9 g/dL
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#1
6 years ago
ANS: B
Because 1 SD is 0.1 g/dL, 2 SD = 0.2 g/dL. Thus 95.5 of the results lie between 13.6 (2 SDs) and 14.0 (+2 SDs).
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