19 basics of charts Flashcards
What is a control chart
provides a basis for deciding whether the variation in the output is due to common causes (in control) or assignable causes (out of control)
What are common causes
in control
what are assignable causes
out of control
How are control charts classified
by the type of data they contain
what is the x bar chart used for
if the quality of output of the process is measured in terms of a variable such as weight, temperature, length and so on
with the x bar chart, the decision to continue or adjust the production is based on what
the mean value found in the sample of the output
the centre line of the chart corresponds to what
the mean of the process when the process is in control
what does the vertical line identifies what
the scale of measurement for the variable of interest
what are UCL and LCL important for
determining whether the process is in control or out of control
What is UCL
upper control limits
what is LCL
lower control limits
Which control chart monitors the range of the measurements
R Chart
Which control chart measures the proportion of defective in the sample
P chart
Which control chart measures the number of defective in the sample
np chart
