i have a splitting headache… completely missed the dartboard!!!
TRANSCRIPT
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I have a splitting headache…
Completely missed the dartboard!!!
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100g
• Refers how close a measurement is to the actual (true) value.
• Dartboard Analogy:
The bull’s eye is the actual point where a person is aiming for.
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Accurate
• “correct”. A measurement is considered accurate if correctly reflects the size of the object being measured.
• How close are you to the actual/accepted value?
• Does the practice of using body parts as measurement tools produce accurate results?
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• Refers how close a a group of measurements are to one another. (reproducibility)
Person
1
2
3
4
5
Measurement (cm)
1.25
1.26
1.24
1.25
1.26
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Precise
• A precise measurement is repeatable and reliable. Getting the same measurement each time.
• Does the practice of using body parts as measurement tools produce precise measurements? (were all of your results the same?)
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Accurate or precise?
Accurate and Precise!
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Accurate or Precise?
neither
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Accurate or Precise?
Precise
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• We can never get a perfect measurement, the best that we can do is get as close as possible within the limitations of our measuring instruments.
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The line falls between23.1 and 23.2
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23.1?
The measurement extends
between 23.1 and 23.2
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Therefore, we can be sure the measurement is 23.1?
This is where “estimation” comes into play…
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Person
1
2
3
4
5
Measurement (cm)
1.25
1.26
1.24
1.25
1.26
1st two numbers (1.2_) are certain.
Last number is (1.2?) uncertain.
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Every measurement
REQUIRES only 1 estimation!!!