Quality Control Measurements
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Quality Control Measurements
Repeated readings and variation
Taking several readings of the same property under the same conditions can help distinguish measurement variation from differences between items in a batch.
- Replicate measurements
- Different properties
- Item-to-item variation
- A change in the target value
- Replicate readings
- Item-to-item variation
- A target measurement
- Scale resolution
- Variations in the raw materials
- Changes in the production process
- Wear on production equipment
- Differences in how operators do a task
Compare two production batches
A New Zealand snack producer aims for a packet mass of 200 g. The quality team weighs five packets from each batch.
Batch
Packet 1
Packet 2
Packet 3
Packet 4
Packet 5
Batch A (g)
198
201
199
202
200
Batch B (g)
194
206
197
203
200
Make a quality-control decision
The producer accepts packets weighing from 196 g to 204 g, inclusive.
3 printable pages
Page 1
Page 2
Page 3
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