M$$a$$s supervisor requested that she evaluate the following glucose control data set.

Day Low High

$186215$

$282212$

$383218$

$487214$

$585220$

$681217$

$788223$

Low mean $=85$

High mean $=217$

SD of low $=2\mathrm{.}6$ and SD low range $=(78\mathrm{.}9-90\mathrm{.}2)$

SD of high $=3\mathrm{.}7$ and SD high range $=(209\mathrm{.}6-224\mathrm{.}4)$

$1.$ How do I plot these control data by day $($one graph for each level, x$-$axis $=$ day, y$-$axis $=$ concentration$)?$ Indicate the mean and the upper and lower control limits $($mean $\backslash$pm $2$ standard deviations$)$ with horizontal lines.

$2.$You are running glucose quality control and obtain the following:

Low control value $=90$ mg$/$dL; High control value $=230$ mg$/$dL$.$ How do I plot these controls on the process control chart $($Levey Jennings$)$ created above?