The Goodman Tire and Rubber Company periodically tests its tires for tread wear under simulated road conditions. To stud

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The Goodman Tire and Rubber Company periodically tests its tires
for tread wear under simulated road conditions. To study and
control the manufacturing process, 20 samples, each containing
three radial tires, were chosen from different shifts over several
days of operation, with the following results. Tread wear
measurements are in hundredths of an inch.
Assuming that these data were collected when the manufacturing
process was believed to be operating in control, develop
the R chart.
Compute the upper and lower control limits for
the R chart. (Round your answers to two decimal
places.)
UCL=LCL=
Construct the R chart.
Assuming that these data were collected when the manufacturing
process was believed to be operating in control, develop
the
x
chart.
Compute the upper and lower control limits for the
x
chart. (Round your answers to two decimal places.)
UCL=LCL=
Construct the
x
chart.