Worksheets9 Unit 17 Statistical process control.
Total questions: 12
Worksheet time: 2mins
What is the main purpose of Statistical Process Control (SPC)?
To replace manual inspection completely
To monitor, analyse, and control variation in a process using statistics
To record machine breakdowns only
To eliminate all human involvement
SPC works on the assumption that:
Each process behaves randomly and unpredictably
Future trends are likely to follow past patterns
All processes produce perfect parts
Variation cannot be measured
Who is credited with developing SPC in the 1920s?
Dr. Walter A. Shewhart
W. Edwards Deming
Joseph Juran
Philip Crosby
Which statement best describes standard deviation?
The middle value of a data set
The most common number in a data set
A measure of how values vary from the mean
The largest value in the data set
Why is collecting large amounts of data important in SPC?
It reduces the cost of analysis
It improves accuracy and reliability of statistical predictions
It makes graphs look more complex
It reduces the need for quality checks
Which of the following is not a type of average?
Mean
Median
Mode
Range
Which quality expert further developed SPC during the 1940s and 1950s?
Karl Pearson
Georges-Louis Leclerc
W. Edwards Deming
Ishikawa
One of the main advantages of SPC is that it:
Increases process variation
Eliminates all product testing
Detects quality issues early, preventing defects
Focuses only on final inspection
What does a scatter graph represent?
The average of production times
The total number of defects in a shift
The relationship between two variables
The variation within one data set
A positive correlation on a scatter graph means:
As one variable increases, the other also increases
As one variable increases, the other decreases
There is no relationship
The data is inconsistent
A line of best fit on a scatter graph is used to:
Highlight outliers only
Show the overall trend or relationship between data points
Calculate the mean value
Identify the standard deviation directly
Which of the following is not an advantage of SPC?
A. Early detection of problems
B. Improved product quality
C. Reduced waste and rework
D. Increased product variation
