Patrick Brewer and David Rose have decided to open a general store in the small town of Schitt's Creek. In their store, local residents are able to purchase an assortment of re-branded local items and crafts ranging from lotions, shampoos, body milks, cat-hair scarves, coffee, tea, toilet plungers, and other various items.

Obviously, in order to be successful, Patrick and David must employee quality assurance measures to make sure their products aren't causing rashes or are otherwise defective.

Possible ideas for quality assurance:

Control charts

Benchmarking

Statistical sampling

Flowcharting

Cause and effect diagrams

Histograms

Pareto charts

Please see the corresponding Excel file provided for a data set of monthly sales.

Discuss and diagram which specific quality assurance method you would suggest they use.