Precision Manufacturing has a government contract to produce stainless steel rods for use in military aircrafts. Each rod is required to be 25 millimeters in diameter. Each hour, random samples of size n = 5 rods are measured to check process control. Four hours of observations yielded the following:

	Diameter
Time	Rod 1	Rod 2	Rod 3	Rod 4	Rod 5
9 A.M.	24.5	24.9	27.9	26	25.9
10 A.M.	25.1	24.7	23	25.4	24.9
11 A.M.	28.9	25	27.9	28.3	26.5
Noon	45	25.2	22.1	28.1	25

• Construct the xbar-chart and the R-chart.

Please include charts below:

• Is the process in control?

xbar chart UCL = R-chart UCL =

xbar chart LCL = R-chart LCL =

Explanation: