Construct the Levy-Jennings chart by following the steps below: 2.1 Plot the observed values on the y-axis and number of analysis on the x-axis. 2.2 Ranges for 1, 2 and 3 SD are marked to delineate test limits 2.3 Connect one point to another by a single line 2.4 Interpret the control chart by considering the trends and shifts of data. +3SD +2SD +1SD MEAN -1SD -2SD -3SD stry
