0.6 Collecting data Flashcards

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1
Q

What is meant by “accurate” results?

A

Results that are close to the true answer

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2
Q

How can you check repeatability?

A

Repeat an experiment at least 3 times and check the results are similar

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3
Q

How can you check reproducibility?

A

Ask a different person to repeat an experiment, or cross-check using a set of readings using a different instrument, to see if the results are similar

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4
Q

What is mean by “precise” results?

A

Results where the data values of repeated experiments are close to the mean (i.e. not spread out)

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5
Q

What is meant by the “resolution” of an instrument?

A

= the smallest change that is detectable by an instrument

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6
Q

What is calibration?

A

A way of ensuring that a measuring device is measuring things accurately

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7
Q

What is a random error?

A

Errors due to unpredictable differences, like human error in measurement

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8
Q

What is a systematic error?

A

Errors where a measurement is wrong by the same amount every time

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9
Q

What is a “zero error”?

A

= a type of systematic error caused by using equipment that isn’t zeroed properly

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10
Q

What is an anomalous result?

A

= a result that doesn’t fit in with the rest

Also known as an outlier.

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