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Data Recording, Analysis and Presentation

Significant figures, estimation and the range

  • 3 things to know
  • Component 01

Overview

Recall questions on rounding to significant figures and decimal places, counting significant figures, reporting results sensibly, estimation, finding the range, estimating a mean from a total, and keeping raw data after a study.

What you need to know

Answer each one before you reveal it.

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Key term

To how many significant figures are results in psychology usually reported?

Key term

The highest score in a data set is 47 and the lowest is 12. State the range.

Key term

Why should a calculated result not be reported to more significant figures than the original data?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Express 0.0384 to two significant figures.

    Model answer

    It is 0.038.

  2. 2

    Express 0.04728 to three significant figures.

    Model answer

    It is 0.0473.

  3. 3

    Express a correlation coefficient of 0.61538 to two decimal places.

    Model answer

    It is 0.62.

  4. 4

    How many significant figures does the value 0.00560 have?

    Model answer

    It has three significant figures.

  5. 5

    Why do the zeros in front of the first non-zero digit not count as significant figures?

    Model answer

    They only fix the position of the decimal point and carry no information about how precisely the value was measured.

  6. 6

    Why should a calculated result not be reported to more significant figures than the original data?

    Model answer

    Extra figures suggest a level of precision that the original measurements never had.

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Range means the highest score minus the lowest score.
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