A manufacturing process can produce two different products A and B$.$ Each day, $600$

units of the product are evaluated at the final inspection stage and the number of defects

is recorded.

i$)$ Show how a single attribute control chart could be used to plot both products on the

same chart and determine the limits of this control chart.

ii$)$ Determine the points you should plot for each subgroup.

iii$)$ Plot the control chart and assess whether the process is in statistical control.