Question: The following sample information was obtained by taking four doughnuts per hour for twelve hours from Fawcett Bakery's doughnut process and weighing them:
For the data shown above,
a. Find the x and R for each sample.
b. Find the x ¼ and R for the twelve samples.
c. Find the 3-sigma UCL and LCL for the mean and range charts.
d. Does the process look to be in statistical control. Why or why not?