Individual Moving Range Chart Exam

A local print shop is attempting to improve its sales. The have gathered total weekly sales over the last $25$ weeks. Please use a control chart to analyze the data and recommend next steps based on your interpretation of the chart. The data follow:

Week Weekly Sales $($$$1000$s$)$

$19$

$22$

$33$

$43$

$55$

$65$

$74$

$86$

$98$

$107$

$118$

$1211$

$134$

$147$

$159$

$165$

$1723$

$186$

$1912$

$203$

$2110$

$223$

$2314$

$249$

$259$

a$.$ The average of the individual data points

b$.$ the average of the moving ranges

c$.$ The upper and lower control limits for the individual $($x$)$ chart$$

d$.$ The upper and lower control limits for the moving range $($MR$)$ chart

e$.$ An interpretation of the completed chart.

f$.$ What next step$($s$)$ should be taken based on the chart interpretation.