supp06pp

# supp06pp - Practice Problems Supplement 6(S6 Statistical...

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Problem 1: Twenty-five engine mounts are sampled each day and found to have an average width of 2 inches, with a standard deviation of 0.1 inches. What are the control limits that include 99.73% of the sample means ( 3)? Z = Problem 2: Several samples of size 8 n = have been taken from today’s production of fence posts. The average post was 3 yards in length and the average sample range was 0.015 yard. Find the 99.73% upper and lower control limits. Problem 3: The average range of a process is 10 lbs. The sample size is 10. Use Table S6.1 to develop upper and lower control limits on the range . Problem 4: Based on samples of 20 IRS auditors, each handling 100 files, we find that the total number of mistakes in handling files is 220. Find the 95.45% upper and lower control limits. Problem 5: There have been complaints that the sports page of the Dubuque Register has lots of typos. The last 6 days have been examined carefully and the number of typos/page is recorded below. Is the

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supp06pp - Practice Problems Supplement 6(S6 Statistical...

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