here are one-month data. The production rate varies from day to day. Number of non-conforming omponents are also given with number inspected. Draw a p-chart and find the control limits. Subgroup no. Number inspected (n¡) Number defective (np) 1 2385 47 2 1451 18 1935 74 4 2450 42 1997 2168 39 52 7 1941 47 1962 34 2244 29 10 1238 39 11 2289 45 12 1464 26 13 2061 47 14 1667 34 15 2350 31 16 2354 38 17 1509 28 18 2190 30 19 2678 113 20 2252 58 1641 1782 21 52 22 19 23 1993 30 24 2382 17 25 2132 46
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
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