A machining operation requires close tolerances on a certain part for automobile engines. The current

specification for this measurement is 3.0 cm .001. The quality control procedure is to take a sample of 4 units and measure each of the parts. On the basis of past samples of size 4,

x

=

3.0

x=3.0

and

R

=

.0020

R=.0020

1. Construct average and range charts for this part.
2. On the basis of the following data, is the process in control?
4. Sample12345
5. x
6. x
7. 3.00052.99043.00103.00153.0008R0.00240.00310.00100.00400.0010
8. Is the process creating output outside of its specifications?