NMSU email address Name 1. Solve the following problems (show all your work): 1.

Question

NMSU email address Name 1. Solve the following problems (show all your work): 1. A company manufacturing oil seals wants to establish Xand R control charts on the process. There are 25 preliminary samples of size 5 on the internal diameter of the seal. The summary data (in mm) are as follows: 225X-1253.75 and .R=14.08 a) Find the control limits that should be used on the x and R control charts. 4. Samples of n 4 items are taken from a process at regular intervals. A normally distributed quality characteristic is measured and Xand s values are calculated for each sample. After 50 subgroups have been analyzed, we have 20. X1000 and 50 s=72 a) Find the control limits that should be used on the X and s control charts. 3. A process is being controlled with a fraction nonconforming control chart. The process average has been shown to be 0.07. Three-sirma control limits are used, and the procedure calls for taking daily samples of 400 items. a) Calculate the upper and lower control limits. 4. Webster Chemical's nominal weight for filling tubes of caulk is 8.00 ounces + 0.60 ounces. The target process capability ratio is 1.33. the current distribution of the filling process is centered on 8.054 ounces with a standard deviation of 0.192 ounces. a) Compute the process capability ratio and process capability index to assess whether the filling process is capable and set properly. Explain your results.

Explanation / Answer

Answer:

1.

Given :

Formula:

For subgroup size of 5 :

Calculation:

Putting the values into formula:

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