# Question: A normally distributed process has specifications of LSL 75

A normally distributed process has specifications of LSL = 75 and USL = 85 on the output. A random sample of 25 parts indicates that the process is centered at the middle of the specification band, and the standard deviation is s = 1.5.

(a) Find a point estimate of Cp.

(b) Find a 95% confidence interval on Cp. Comment on the width of the interval.

(a) Find a point estimate of Cp.

(b) Find a 95% confidence interval on Cp. Comment on the width of the interval.

## Answer to relevant Questions

A company has been asked by an important customer to demonstrate that its process capability ratio Cp exceeds 1.33. It has taken a sample of 50 parts and obtained the point estimate Cp = 152. Assume that the quality ...Consider a simplified version of equation 8.19 (below). Note that this was obtained by assuming that the term 9n in equation 8.19 will probably be large. Rework Exercise 8.24 using this equation and compare your answer to ...A measurement systems experiment involving 20 parts, three operators, and two measurements per part is shown in Table 8E.12. (a) Estimate the repeatability and reproducibility of the gauge (b) What is the estimate of total ...Two resistors are connected to a battery as shown in the figure. Find approximate expressions for the mean and variance of the resulting current (I). E, R1, and R2 are random variables with means E ,R 1 ,R2 and ...Estimate process capability using the x and R charts for the power supply voltage data in Exercise 6.8 (note that early printings of the 7th edition indicate Exercise 6.2). If specifications are at 350 ± 50 V, calculate Cp, ...Post your question