The postmaster of a small western town receives a certain number of complaints each day about mail delivery. Number of Complaints Day Number of Complaints 1 4 2 11 3 16 4 8 5 9 6 6 7 5 8 12 9 14 10 7 11 6 12 4 13 2 14 9 Determine three-sigma control limits using the above data. Round you intermediate calculations to 4 decimal places and final answers to 3 decimal places. Enter 0 wherever required. Round up any negative control limit value to zero
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.
The postmaster of a small western town receives a certain number of complaints each day about mail delivery.
Number of Complaints
Day Number of Complaints
1 4
2 11
3 16
4 8
5 9
6 6
7 5
8 12
9 14
10 7
11 6
12 4
13 2
14 9
Determine three-sigma control limits using the above data. Round you intermediate calculations to 4 decimal places and final answers to 3 decimal places. Enter 0 wherever required. Round up any negative control limit value to zero
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