The following 20 hemoglobin results were collected for Level I control to determine its initial control limit (Results are in g/dL):
$\begin{array}{lllll}
6.2 & 6.5 & 5.4 & 6.0 & 6.4 \
5.8 & 6.0 & 5.9 & 5.7 & 6.1 \
6.1 & 6.1 & 6.6 & 6.2 & 6.4 \
5.7 & 6.2 & 6.3 & 5.9 & 5.8
\end{array}$
What are the 2s limits?

Question

The following 20 hemoglobin results were collected for Level I control to 	determine its initial control limit (Results are in g/dL): 
$\begin{array}{lllll}
6.2 & 6.5 & 5.4 & 6.0 & 6.4 \
5.8 & 6.0 & 5.9 & 5.7 & 6.1 \
6.1 & 6.1 & 6.6 & 6.2 & 6.4 \
5.7 & 6.2 & 6.3 & 5.9 & 5.8
\end{array}$
What are the 2s limits?

Quizplus · Accepted Answer

The mean of the data is 6.05 g/dL and the standard deviation is approximately 0.29 g/dL. The 2s limits are calculated as mean ± 2*standard deviation, which gives 5.47 to 6.63 g/dL, rounded to 5.5 to 6.7 g/dL.

The Following 20 Hemoglobin Results Were Collected for Level I