In a weaving operation, the parameter to be controlled is the number of defects per 10 square yards of material. Control chart appropriate for this task is-a)P andndash; chartb)C andndash; chartc)R andndash; chartd)X - chartCorrect answer is option 'B'. Can you explain this answer?

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In a weaving operation, the parameter to be controlled is the number of defects per 10 square yards of material. Control chart appropriate for this task is-

a)
P – chart
b)
C – chart
c)
R – chart
d)
X̅ - chart

Correct answer is option 'B'. Can you explain this answer?

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In a weaving operation, the parameter to be controlled is the number o...

In a weaving operation, the parameter to be controlled is the number of defects per 10 square yards of material. Control chart appropriate for this task is C chart.

Explanation:

Control charts are statistical tool, showing whether a process is in control or not.

Two types of process data:

Variable is a continuous data, things we can measure; Example includes length, weight, time, temperature, diameter, etc.
Attribute is a discrete data, things we count; Examples include number or percent defective items in a lot, number of defects per item etc.

Types of Control Charts:
Variable charts are meant for variable type of data. X bar and R Chart, X bar and sigma chart, chart for the individual units
Attribute charts are meant for attribute type of data. p chart, np chart, c chart, u chart, U chart

Control charts for the variable type of data (X bar and R charts)

In the x bar chart, the sample means are plotted in order to control the mean value of a variable
In R chart, the sample ranges are plotted in order to control the variability of a variable

Control charts for Attribute type data (p, c, u charts)

p-charts calculates the percent defective in sample; p-charts are used when observations can be placed in two categories such as yes or no, good or bad, pass or fail etc.
c-charts counts the number of defects in an item; c-charts are used only when the number of occurrences per unit of measure can be counted such as number of scratches, cracks etc.
u-chart counts the number of defects per sample; The u chart is used when it is not possible to have a sample size of a fixed size

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In a weaving operation, the parameter to be controlled is the number o...

) P-chart

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In a weaving operation, the parameter to be controlled is the number of defects per 10 square yards of material. Control chart appropriate for this task is-a)P – chartb)C – chartc)R – chartd)X̅ - chartCorrect answer is option 'B'. Can you explain this answer?

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