What is a measurement error? Explain it in simple terms.
a mistake when taking a measurement.
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15
Define "accuracy". Explain it in simple terms.
How close a set of measured values are to the "true value".
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15
Which type of error affects all measurements?
systematic
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15
What is a random error? What are two characteristics of it? 1. It affects ___ measurement (can cause an ___________ result) 2. the result is __________
Examples: Parallax error / random fluctuations
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15
Why should measurement be repeated? (two reasons)
to spot anomalies (random errors) / to calculate a mean (which reduces random errors)
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thief
Give points!
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25
star
Double points!
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shark
Other team loses 25 points!
Okay!
thief
Give points!
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seesaw
Swap points!
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rocket
Go to first place!
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rocket
Go to first place!
Okay!
thief
Give points!
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25
trap
No points!
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fairy
Take points!
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25
rocket
Go to first place!
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lifesaver
Give 25 points!
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15
Which type of error affects a single measurement?
random
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15
Decide if the source is from a random or systematic error: taking temperature readings with a thermometer while the mercury level is still rising.
random
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15
What is a systematic error? What are two characteristics of it? 1. It affects ___ measurement(s) 2. the result is __________
Examples: Zero error / incorrect technique
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15
Calculate the mean of the following distance measurements: 12.8 cm, 12.7 cm, 13.0 cm, 10.5 cm, 12.9 cm
12.8 cm + 12.7 cm + 13.0 cm + 12.9 cm / 4 = 12.85 (Mean) *ignore 10.5*
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15
Which type of error can be reduced by calculating a mean?
random errors
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15
Decide if the source is from a random or systematic error: Measuring distance using a metre ruler which has been worn down by years of use so that the zero mark is missing.
systematic
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15
Define "precision". Explain it in simple terms.
How close a set of measured values are to the MEAN.
