Statistical quality control tools and techniques ppt

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Ppt On S. It describes the spread out of the data around the mean. Knowing the central point of a set of data is highly important. It is possible to have a shift in the mean of the product but not a change in the dispersion. A process is considered in statistical control if it has no assignable causes, only natural variation. In this example of the bottling operation, bottles filled with

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  • Statistical quality control (SQC) is theterm used to describe the set SPC Methods-Control Charts Control Charts show sample data plotted.

    STATISTICAL QUALITY CONTROL (S.Q.C.) PRESENTED BY-: NIKHIL specification, which requires use of tools & techniques of statistics. Its techniques find extensive applications in quality control, production Statistical process control (SPC) A statistical tool that involves.
    Ten items are chosen in every sample.

    C…………… Limitations of S. See our Privacy Policy and User Agreement for details. Numerical: Numerical A quality control inspector at the GSK company has taken twenty-five samples of mouthwash with four observations each of the volume of bottles filled.

    images statistical quality control tools and techniques ppt

    These parameters define the acceptance sampling plan.

    images statistical quality control tools and techniques ppt
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    Slide Numerical A production manager at a tire manufacturing plant has inspected the number of defective tires in twenty random samples with twenty observations each.

    Consumers will usually tolerate a few more defects, but at some point the number of defects reaches a threshold level beyond which consumers will not tolerate them. This threshold level is called the lot tolerance percent defective LTPD. To compute the mean, sum all the observations and divide then by the total number of observations. No notes for slide.

    They also help us identify a change or variation in some quality characteristic of the product or process.

    Use other statistical process control problem-solving tools. 2. © John Wiley 1) Control charts are a proven technique for improving productivity. 2) Control. PowerPoint Presentation by R.B. Clough – UNH. M. E. Henrie - UAA.

    Video: Statistical quality control tools and techniques ppt Ch6: Statistical Quality Control Video

    © Wiley Three SQC Categories. Statistical quality control (SQC) is the term used to describe the set of Traditional Statistical Tools SPC Methods-Control Charts. Methods and Philosophy of Statistical Process Control. Basic SPC Tools. In statistical control: a process operating with only chance causes of variation; Out of.
    For this we need tools in the statistical process control SPC category.

    Also, if the problem is allowed to persist, it will continue to create a problem in the quality of the product. When observed values go outside the control limits, the process is assumed not to be in control.

    Acceptance sampling after process: Acceptance sampling after process Sampling after the process involves sampling finished items that are to be marketed either to a retail store or to a distribution center.

    Construct an AOQ curve for this sampling plan and interpret its meaning.

    images statistical quality control tools and techniques ppt
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    Types of control charts for variables: Types of control charts for variables Two of the most commonly used control charts for variables monitor both the central tendency of the data the mean and the variability of the data either the standard deviation or the range.

    Presentation Description No description available. The equation for computing the mean is; 2- Range : 2- Range It refers to the difference between the largest and smallest observations in a set of data.

    STATISTICAL QUALITY CONTROL authorSTREAM

    Single Sampling Plan Count the no. GSK may still be producing bottles with an average fill of Although descriptions of certain characteristics are helpful, they are not enough to help us evaluate whether there is a problem with quality. Types of control charts for attributes: Types of control charts for attributes.

    Tools of Quality.

    A PowerPoint Training Presentation The Basic Seven Tools made statistical analysis less complicated for the average person. Good Visual Aids make statistical and quality control more comprehendible. The Basic Seven. Categories of statistical quality control The tools in each of the categories . 1- Single sampling In this sampling technique, a random sample is.

    Statistical Quality Control. Quality Control Charts using Excel II This makes the control chart an ideal tool for the shop floor, where quick and easy methods are.
    Slide Formulae for computing central line Formulae for computing sample standard deviation Formulae for computing upper control limits Formulae for computing lower control limits. The chance of this happening is given by the percentage or probability represented by the shaded areas in a control chart. Calculate each sample observations own mean X-bar Compute the center line of the chart as the mean of all sample means Mean of all X-bars.

    However, the dispersion of the product may have increased. When a distribution is symmetric there are the same number of observations below and above the mean.

    images statistical quality control tools and techniques ppt

    US They also help us identify a change or variation in some quality characteristic of the product or process.

    images statistical quality control tools and techniques ppt
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    Just think how important that number is when you receive test scores!

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    images statistical quality control tools and techniques ppt

    Examples are the proportion of broken ampoules in a batch and the proportion of misprinted labels in a batch of syrup. Show related SlideShares at end.

    Video: Statistical quality control tools and techniques ppt Statistical Process Control (SPC) - English Version

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