Fig. 1

Case study 1. Quail eggs not cracked per eggs laid. The response was percent eggs not cracked per eggs laid (PNCL). In the box plot of study data, the bottom and top of the boxes are the 25th and 75th percentiles of the indicated treatment group, the horizontal line between the top and bottom is the median, the mean is an open circle, whiskers extend from top or bottom to most extreme non-outliers, with outliers indicated as Xs beyond the whiskers. Individual historical control data mean responses are indicated by black asterisks. HCD data from 2003 to 2005 are displayed to the left of the 2006 study data, while HCD data from 2006 to 2009 are displayed to the right. The dashed lines are the 97.5th and 2.5th quantiles of the distribution of HCD in the time interval shown