In establishing a reference interval, data are plotted on normal-probability paper, and the resulting line curves away from linearity at the upper portion of the plot.What is the next step that should be taken in determining the reference interval?

Question

Quizplus · Accepted Answer

The parametric method used for determining reference limits is based on the assumption that the observed values follow a normal (or Gaussian) distribution.If such data are plotted on normal-probability paper, normally distributed data will appear as a straight line.If curvature is present in this plot, the next step would be to plot the data on log-probability paper in an attempt to transform the data into a Gaussian distribution.If this step is successful, data are said to follow a log-normal distribution and can be used to determine the reference interval.

In Establishing a Reference Interval, Data Are Plotted on Normal-Probability