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:

Question

Quizplus · Accepted Answer

Since 1 SD from the mean covers 68.3% of the results (34.1% on each side), we need to multiply this by 2 to cover 95.5% of the results. This means that the range of results for 95.5% of the values would be mean +/- 2 SDs, or 13.8 +/- 0.2 g/dL. Therefore, the correct answer is B, which is the only choice that falls entirely within the range of 13.6 to 14.0 g/dL.

A Clinical Laboratory Scientist Performs 30 Replicate Hemoglobin Determinations on a Single