Working scientifically AQA subject specific vocab

What is considered an accurate measurement?

• A measurement with a wide range

• A measurement that is repeatable

• A measurement with no errors

• A measurement close to the true value

What are anomalies in a set of results?

• Values that are part of random uncertainty

• Values that do not fit the pattern or are not in the expected range

• Values that are always precise

• Values that are always accurate

What causes random errors?

• Errors that can be corrected

• Consistent measurement techniques

• Predictable variations

• Unpredictable variations from one measurement to the next normally human error

How can the effect of random errors be reduced?

• By using the same equipment

• By making more measurements and calculating a new mean

• By changing the environment

• By using a different technique

What is a systematic error?

• An error that is unpredictable

• An error that can be corrected by simple repeats

• An error that differs from the true value by a consistent amount - like your scales not being at zero

• An error that varies randomly

What is a zero error?

• An error that results in a random uncertainty

• An error that can be corrected by using a different technique

• An error that occurs when the true value is zero

• An error that occurs when a measuring system gives a false reading at zero i.e you didn't zero your balance

What defines a fair test?

• Both variables affect each other equally

• Only the dependent variable affects the independent variable

• Neither variable affects the other

• Only the independent variable is changed to see the affect on the dependent variable

What does precision in measurements indicate?

• The accuracy of the measurements

• How close the measurements are to one another

• How close results are to the true value

• The validity of the experiment

What is the range in an experiment?

• The spread of random errors

• The accuracy of the measurements

• The average of all measurements

• The difference between the maximum and minimum values

What does it mean if a measurement is repeatable?

• The measurement can be repeated by anyone

• The original experimenter can repeat the investigation and obtain the same results

• The measurement is always accurate

• The measurement is always precise