Which control chart should be used for the above data and


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

4

3

3

2

1

0

4

5

6

7

7

7

9

6

5

4

2

3

0

2

2

3

4

3

• which control chart should be used for the above data and why?

• Make the appropriate control chart on a graph paper.

• interpret the chart and give your recommendation. Whether the process is in control or not?

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