6.35. The following x and s charts based on n = 4 have shown statistical control: Chart s Chart UCL = 710 UCL = 18.08 Center line = 700 Center line = 7.979 LCL = 690 LCL = 0 a. Estimate the process parameters / and a. b. If the specifications are at 705 + 15. and the pro- cess output is normally distributed, estimate the fraction nonconforming. c. For the x chart. find the probability of a type I error, assuming o is constant