Suggest a heat treating process for steel. This steel is to be used in constructing bridges and the customer has set specifications on the steel at 50 +/- 5 psi. Based upon a sample from process, we conclude from an NPP that the assumption of normality is reasonable, and we compute a sample average of 48 psi and a sample standard deviation of 1psi.
a) What are the USL and the LSL for this process?
b) What are the UNTL and the LNTL for this process?
c) What is a point estimate of Cp for this process ?
d) What is a point estimate of Cpk for this process ?
e) What is a point estimate of Cpm for this process ?
f) Calculate a 95% C.I. for the mean of the process
g) Calculate a 95% C.I. for Cp
h) Calculate a 95% C.I. for Cpk
i) Calculate a 95% C.I. for Cpm
j) Estimate the process fraction nonconforming?