QuestionQuestion

1. X-bar and R charts are maintained on a certain quality characteristic based on a subgroup size of 4. The specifications require that the quality characteristic must be between 345 and 355 lb. On a certain day, data for 25 subgroups of size 4 were collected. ∑X-bar is found to be 8,745.2 and ∑R is found to be 62.8. Assume that the process was in statistical control that day.
a) Calculate the 3-sigma control limits for the X-bar and R control charts
b) If the mean of the process shifts to 347 lb the next day, compute the probability that the shift will not be detected on the X-bar chart on the first subgroup plotted after the shift takes place. Assume no change in Ợ
c) Assuming normal distribution of process output, what proportion of nonconforming units would be produced at this new value of the mean.

Solution PreviewSolution Preview

These solutions may offer step-by-step problem-solving explanations or good writing examples that include modern styles of formatting and construction of bibliographies out of text citations and references. Students may use these solutions for personal skill-building and practice. Unethical use is strictly forbidden.

    By purchasing this solution you'll be able to access the following files:
    Solution.pdf.

    50% discount

    Hours
    Minutes
    Seconds
    $27.00 $13.50
    for this solution

    or FREE if you
    register a new account!

    PayPal, G Pay, ApplePay, Amazon Pay, and all major credit cards accepted.

    Find A Tutor

    View available Engineering - Other Tutors

    Get College Homework Help.

    Are you sure you don't want to upload any files?

    Fast tutor response requires as much info as possible.

    Decision:
    Upload a file
    Continue without uploading

    SUBMIT YOUR HOMEWORK
    We couldn't find that subject.
    Please select the best match from the list below.

    We'll send you an email right away. If it's not in your inbox, check your spam folder.

    • 1
    • 2
    • 3
    Live Chats