Each day, a factory counts the number of machine failures. The counts for $25$ consecutive days are plotted in the c$-$chart below. In these samples, the process is in control with a steady average of about $1\mathrm{.}8$ machine failures per day. Click on the graph to generate a new set of samples. Observe how the c$-$chart behaves when the process is in control. Continue clicking until you think you have a good sense of a c$-$chart in control.

$0$

$5$

$10$

$15$

$20$

$25$

$0$

$2$

$4$

$6$

$8$

Sample Number