An MBA student has joined Precision Manufacturers as a Quality Analyst. One of his first assignments is to introduce quality initiatives in the production of shafts used in engine lathes. Attached to the machine-producing shafts is an X-bar chart and R chart for monitoring the diameter of shafts. The present control chart has Center Line (mean X) = 2.5 inches, and three standard deviation control limits of UCL = 2.518 inches and LCL = 2.482 inches.

In his enthusiasm to reduce inspection costs, he decides to reduce the current sample size of 20 units to 10 units.

Compute the revised control limits for the X-bar chart and R-chart for the new sample size of 10 units.