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*
Which type of error can be reduced by calculating a mean?
random errors
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
Define "accuracy". Explain it in simple terms.
How close a set of measured values are to the "true value".
What is a measurement error? Explain it in simple terms.
a mistake when taking a measurement.
Decide if the source is from a random or systematic error: relying on your own reaction time when starting and stopping a stopwatch to take measurements of time.
random
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
Define "precision". Explain it in simple terms.
How close a set of measured values are to the MEAN.
Which type of error affects a single measurement?
random
Why should measurement be repeated? (two reasons)
to spot anomalies (random errors) / to calculate a mean (which reduces random errors)
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
Which type of errors are predictable?
systematic errors
Which type of errors are consistent? (What does consistent mean?)
systematic errors / happens a lot over time, you can count on it to happen, you can expect it to happen
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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