The depth of a keyway is an important part quality characteristic. Samples of size n = 5 are taken every four hours from the process and 20 samples are summarized as follows:

(a) Using all the data nd trial control limits for? and R charts. Use the coded units. Round your answers to 1 decimal place (e.g. 98.7]. )7 Control Limits: UCL= If LCL= IJ R Control Limits: m=n l {b} Construct Y and R control charts using the control limits from part (a) to identify out-of-control points. [Use Minitab, Excel or any other statistical software.) The process appears to be outofcontrol. Statistical Tables and Charts in control