# Topic 9 - SQC Flashcards

1
Q

Descriptive Statistics

A

Describe the quality characteristics; this includes Mean, Standard deviation (SD), range and measure of distribution of data.

2
Q

Acceptance Sampling

A

Randomly inspecting a sample of goods and deciding whether to accept the entire lot based on the results.

3
Q

Statistical process control

A

Inspecting a random sample to decide whether the product characteristics are within the certain acceptable bounds (process capability and control charts)

4
Q

What are the phases of quality contol?

A

1) Acceptance sampling
2) Statistical process control
3) Continuous improvement and Six Sigma

5
Q

Random Variation

A

Natural variations in the output of process, created by countless minor factors.

6
Q

Assignable variation

A

A variation whose source cay be identified and eliminated.

7
Q

Variables

A

to monitor characteristics that can be measured and have a continuum of values, such as height, weight, or volume.

8
Q

Attributes

A

to monitor characteristics that have discrete values and can be counted.

9
Q

X-Bar Chart

A

All samples are in control

10
Q

R Chart

A

One sample is out of control

11
Q

P-Chart

A

to monitor the proportion of defective in a process.

12
Q

What are the nonrandom patterns in control charts

A

1) Trend
2) Cycles
3) Bias
4) Level Shift
5) Too much Dispersion

13
Q

Trend

A

Sustained upward or downward movements

14
Q

Cycle

A

Wave patterns

15
Q

Bias

A

Too many observations on one side of the centre line

16
Q

Level shift

A

A shift in the level

17
Q

Too much dispersions

A

The values are too spread out