Data and measurement re-cap 12 IB

A student investigated which laundry enzymes work best.

Are their results?

• Qualitative

• Quantitative

• Both

Human reaction time would be classified as:

• Random error as it's in two directions

• Systematic error as it's in two directions

• Random error as it's in one direction

• Systematic error as it's in one direction

Consider the following image.

What would happen if the observer was taller and reading from a higher viewpoint to this eye?

• The value read would appear higher

• The value read would be lower

• The same value would be read

Select the correct combination

• Random error

  Multidirectional

  Accuracy

  Validity

• Random error

  Unidirectional

  Accuracy

  Reliability

• Systematic error

  Multidirectional

  Precision

  Reliability

• Systematic error

  Unidirectional

  Accuracy

  Validity

• Systematic error

  Unidirectional

  Precision

  Validity

• 2

• 1

• 4

• 6

How many sig figs for:

6.00

• 1

• 3

• 2

How many sig figs for:

0.0018

• 5

• 2

• 3

• 1

How many sig figs for:

8800

• 2

• 4

• 1

Which of the following is NOT an example of a systematic error?

• Evaporation of volatile liquid on heating

• Faulty gas syringe

• Calibration issue with pH meter

• Reading a titre that sits between two calibration lines

State the uncertainty