Suppose a comparison of variation is required between analytical methods, one of which is reported in mg/dL and the other reported in mmol/L. Which of the following measures of variation would be most appropriate?

Which of these has 1⁄2 of the points above and 1⁄2 below?

What should the mean value of the QC material be in the above chart?

Which of these is affected by extreme values

Which of these is not a measure of variation? 

Which of the following best describes the analysis of samples to establish reference intervals for a new laboratory method?

Which of these is not a measure of the middle?

The limit of detection: 1. is the minimum concentration of analyte whose presence can be qualitatively detected under defined conditions. 2. is the concentration at which an observed value will be very likely to exceed the limit of the blank. 3. is the highest value of a zero sample. 4. is the minimum concentration of analyte whose presence can be quantifiably measured reliably under defined conditions.

Cyclic variations refer to changes in concentration of analytes that occur in a predictable manner. ______ variation is a phrase used to describe reproducible variation that occurs during the course of a single day, and ______ variation is a phrase used to describe reproducible variation that occurs over a period of greater than one day. 

La bicicleta __________ de Laura.