Please read the case study given below and answer questions given at the end. A manufacturing plant make wind mill assemblies & can produce 50 units in a month in two period of 15 days each ; following is the data for number of defects arising per month. Month JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Number of Defects per period 43 3 2 1 0 4 5 6 7 7 7 96 5 4 2 3 0 2 2 3 4 3 Question I: Which control chart should be used for the above data and why?
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Answer 1: For the given data, we shall us a C-Chart. A c-chart is an attributes control chart used with data collected in subgroups that are the same size. C-charts show how the process, measured by the number of nonconformities (defects) per item or group of items, changes over time. Note: U charts can also be used to depict the changes in defects per unit. However, we choose to use C-Charts.
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