The data in worksheet EXCEL Template for Question 12 with data list electrical resistance values (ohms) for 30 samples of size 5 that were taken from Babbage Chips, Inc.'s computer chip-making process over a 25-hour period.

a. Compute the mean, standard deviation and other descriptive statistics for the data.

b. Calculate the control limits and construct the x- and R-charts, using the 30 samples. Is the process under control at that point?

c. Specifications for the process are 9.2 3.2 ohms. If the process is under control, calculate the capability indexes, Cpu, Cpl, Cp,and Cpkusing the part of the and R-charts Excel template that calculates the process capability. What do the indexes indicate? You can use the template for your calculations and Graphs.