Question: During a 4 week inspection period, the number of defects listed in the table were found in a sample of 400 electronic components. Construct a c-chart for these data. Does it appear as though there existed an assignable cause of variation during inspection period?
Date Number of
defects
1 7
2 8
3 9
4 8
5 3
6 9
7 5
8 6
9 15
10 9
11 6
12 8
13 16
14 2
15 4
16 2
17 6
18 5
19 3
20 7