# Question: Sample of 25 measurements on a normally distributed quality characteristic

Sample of 25 measurements on a normally distributed quality characteristic has a mean of 85 and a standard deviation of 1. Using a confidence probability of 0.95, find a value such that 90% of the future measurements on this quality characteristic will lie above it.

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A sample of 20 measurements on a normally distributed quality characteristic had x = 350 and s =10 . Find an upper natural tolerance limit that has probability 0.90 of containing 95% of the distribution of this quality ...Consider the hole diameter data in Exercise 6.9. Estimate process capability using x and R charts. If specifications are 0 ± 0.01, calculate Cp, Cpk, and Cpkm. Interpret these ratios. Consider the loan processing cycle time data in Exercise 8.15. Set up an EWMA control chart for monitoring this process using = 0.1. Does the process seem to be in statistical control? x p50 18.05; p84 20.53; ...Rework Exercise 9.1 using a standardized CUSUM. Exercise 9.1 Reconstruct the control chart in Exercise 9.27 using = 0.1 and L = 2.7. Compare this chart with the one constructed in Exercise 9.27. Assume = 0.05. CL = 0 = 8.02, UCL = 8.05, LCL = 7.99Post your question