The data in following Table represent the number of defects detected in a series of 15 samples.
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Question:
The data in following Table represent the number of defects detected in a series of 15 samples. Each sample contained 4 units.
Sample……………..Defective
1………………………26
2………………………23
3………………………32
4………………………35
5………………………25
6………………………32
7………………………20
8………………………0
9………………………6
10……………………..2
11……………………..5
12……………………..16
13……………………..5
14……………………..9
15……………………..12
Requirements:
a). What is the estimate of the average number of defects per sample?
b). Using 3-sigma limits, what is the UCL for the c-chart?
c). Using 3-sigma limits, what is the LCL for the c-chart?
d). For this c-chart, what conclusion can be drawn?
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